diff --git a/services/web/TpdsWorker.coffee b/services/web/TpdsWorker.coffee
index 5ffc1e303d..cfc5dcd875 100644
--- a/services/web/TpdsWorker.coffee
+++ b/services/web/TpdsWorker.coffee
@@ -33,26 +33,50 @@ processingFuncs =
 			else
 				callback()
 
-	pipeStreamFrom: (options, callback)->
+	pipeStreamFrom: (options, _callback)->
+		callback = (args...) ->
+			_callback(args...)
+			_callback = () ->
+
 		if options.filePath == "/droppy/main.tex"
 			request options.streamOrigin, (err,res, body)->
 				logger.log options:options, body:body
+
 		origin = request(options.streamOrigin)
+
+		cancelled = false
+		gotResponse = false
+		origin.on 'response', (res) ->
+			return if cancelled
+			gotResponse = true
+			if 200 <= res.statusCode < 300
+				dest = request(options)
+				origin.pipe(dest)
+
+				dest.on "error", (err)->
+					logger.error err:err, options:options, "something went wrong in pipeStreamFrom dest"
+					callback(err)
+					
+				dest.on 'end', callback
+			else
+				error = new Error("received non-success status code: #{res.statusCode}")
+				logger.error err: error, options: options, "something went wrong connecting to origin"
+				callback(error)
+
 		origin.on 'error', (err)->
+			return if cancelled
+			gotResponse = true
 			logger.error err:err, options:options, "something went wrong in pipeStreamFrom origin"
-			if err?
-				callback(err)
-			else
-				callback()
-		dest = request(options)
-		origin.pipe(dest)
-		dest.on "error", (err)->
-			logger.error err:err, options:options, "something went wrong in pipeStreamFrom dest"
-			if err?
-				callback(err)
-			else
-				callback()
-		dest.on 'end', callback
+			callback(err)
+
+		setTimeout () ->
+			return if gotResponse
+			cancelled = true
+			error = new Error("timeout")
+			logger.error err: error, options: options, "timeout"
+			callback(error)
+		, 2000
+
 
 
 workerRegistration = (groupKey, method, options, callback)->
diff --git a/services/web/app/views/layout.jade b/services/web/app/views/layout.jade
index 74ac1276cd..a849944252 100644
--- a/services/web/app/views/layout.jade
+++ b/services/web/app/views/layout.jade
@@ -28,7 +28,7 @@ html(itemscope, itemtype='http://schema.org/Product')
 				ga('send', 'pageview');
 		- else
 			script(type='text/javascript')
-				window.ga = function() {};
+				window.ga = function() { console.log("Sending to GA", arguments) };
 
 		script
 			window.csrfToken = "#{csrfToken}";
diff --git a/services/web/app/views/templates.jade b/services/web/app/views/templates.jade
index cb582e7c42..aaccdbde8a 100644
--- a/services/web/app/views/templates.jade
+++ b/services/web/app/views/templates.jade
@@ -434,6 +434,15 @@
 						i.icon-remove
 				.change-list-area
 			.track-changes-diff
+			.track-changes-upgrade-popup(style="display: none;")
+				.message.show-when-owner
+					p You need to upgrade your plan to use the History feature.
+					button.btn.btn-primary.start-free-trial Start free trial
+				.message.show-when-not-owner
+					p Please ask the project owner to upgrade to use the History feature.
+			.track-changes-upgrade-control(style="display: none;")
+				.message History is not yet enabled for this project.
+				button.btn.btn-primary.btn-large.upgrade Enable History
 
 	script(type='text/template')#trackChangesDiffTemplate
 		.track-changes-diff-toolbar.btn-toolbar
@@ -463,6 +472,12 @@
 		ul.change-list.nav.nav-pills.nav-stacked
 			li.loading-changes Loading...
 			li.empty-message You haven't made any changes yet!
+			li.track-changes-upgrade-oneweek(style="display: none;")
+				p We only store one week of changes for free accounts.
+				p.show-when-owner Upgrade for an unlimited history.
+				p.show-when-owner
+					button.btn.btn-primary.start-free-trial Start free trial
+				p.show-when-not-owner Please ask the project owner to upgrade.
 
 	script(type='text/template')#hotKeysListTemplate
 		.hotkeys
diff --git a/services/web/public/coffee/account/AccountManager.coffee b/services/web/public/coffee/account/AccountManager.coffee
index 2120ce35bc..5329d36de3 100644
--- a/services/web/public/coffee/account/AccountManager.coffee
+++ b/services/web/public/coffee/account/AccountManager.coffee
@@ -25,8 +25,19 @@ define [
 				},{
 					text: "Enter Billing Information"
 					class: "btn-primary"
-					callback: () ->
-						window.location = "/user/subscription/new?planCode=student_free_trial"
+					callback: () =>
+						options.onUpgrade?()
+						@gotoSubscriptionsPage()
+				}]
+
+		gotoSubscriptionsPage: () ->
+			window.open("/user/subscription/new?planCode=student_free_trial")
+			Modal.createModal
+				title: "Please refresh"
+				message: "Please refresh this page after starting your free trial. This will make sure all of your features are enabled."
+				buttons: [{
+					text: "OK"
+					class: ""
 				}]
 
 		showUpgradeDialog: (ide, options = {}) ->
diff --git a/services/web/public/coffee/analytics/AnalyticsManager.coffee b/services/web/public/coffee/analytics/AnalyticsManager.coffee
index 9b2bc49702..e06cf264c3 100644
--- a/services/web/public/coffee/analytics/AnalyticsManager.coffee
+++ b/services/web/public/coffee/analytics/AnalyticsManager.coffee
@@ -1,4 +1,6 @@
-define () ->
+define [
+	"libs/md5"
+], () ->
 	class AnalyticsManager
 		constructor: (@ide) ->
 			@ide.editor.on "update:doc", () =>
@@ -14,3 +16,18 @@ define () ->
 					ga('send', 'event', 'editor-interaction', 'single-compile')
 				if @compileCount == 3
 					ga('send', 'event', 'editor-interaction', 'multi-compile')
+
+		getABTestBucket: (test_name, buckets = []) ->
+			hash = CryptoJS.MD5("#{@ide.user.get("id")}:#{test_name}")
+			bucketIndex = parseInt(hash.toString().slice(0,2), 16) % buckets.length
+			return buckets[bucketIndex]
+
+		startABTest: (test_name, buckets = []) ->
+			value = @getABTestBucket(test_name, buckets)
+			ga('send', 'event', 'ab_tests', test_name, "viewed-#{value}")
+			return value
+
+		endABTest: (test_name, buckets = []) ->
+			value = @getABTestBucket(test_name, buckets)
+			ga('send', 'event', 'ab_tests', test_name, "converted-#{value}")
+			return value
\ No newline at end of file
diff --git a/services/web/public/coffee/pdf/CompiledView.coffee b/services/web/public/coffee/pdf/CompiledView.coffee
index cae6cbb948..9c3684aa18 100644
--- a/services/web/public/coffee/pdf/CompiledView.coffee
+++ b/services/web/public/coffee/pdf/CompiledView.coffee
@@ -90,7 +90,7 @@ define [
 			logButtonHtml = "Logs"
 
 			if compileErrors?
-				for error in compileErrors.all
+				for error in compileErrors.errors.concat(compileErrors.warnings).concat(compileErrors.typesetting)
 					errorView = new LatexErrorView(@options.manager.ide, error)
 					errorView.render()
 					@errorViews.push(errorView)
diff --git a/services/web/public/coffee/project-members/ProjectMembersManager.coffee b/services/web/public/coffee/project-members/ProjectMembersManager.coffee
index 82ff4bfdcc..d597345777 100644
--- a/services/web/public/coffee/project-members/ProjectMembersManager.coffee
+++ b/services/web/public/coffee/project-members/ProjectMembersManager.coffee
@@ -76,17 +76,18 @@ define [
 			@ide.socket.emit "removeUserFromProject", member.id
 
 		addMember: (email, privileges) ->
+			console.log "Adding member", email
 			@ide.socket.emit "addUserToProject", email, privileges, (error, added) =>
 				if error?
 					@ide.showGenericServerErrorMessage()
 					return
 				if !added
+					console.log "got response", error, added
 					ga('send', 'event', 'subscription-funnel', 'askToUpgrade', "projectMemebrs")
 					AccountManager.askToUpgrade @ide,
 						why: "to add additional collaborators"
 						onUpgrade: () => 
 							ga('send', 'event', 'subscription-funnel', 'upgraded-free-trial', "projectMemebrs")
-							@addMember(email, privileges)
 
 		afterMemberRemoved: (memberId) ->
 			for member in @members.models
diff --git a/services/web/public/coffee/track-changes/ChangeListView.coffee b/services/web/public/coffee/track-changes/ChangeListView.coffee
index 80a0fb0915..1212faa1fe 100644
--- a/services/web/public/coffee/track-changes/ChangeListView.coffee
+++ b/services/web/public/coffee/track-changes/ChangeListView.coffee
@@ -40,6 +40,9 @@ define [
 				overflow: "scroll"
 			this
 
+		remove: () ->
+			@undelegateEvents()
+
 		addItem: (model) ->
 			index = @collection.indexOf(model)
 			previousModel = @collection.models[index - 1]
@@ -208,6 +211,17 @@ define [
 			else
 				@$el.addClass("first-in-day")
 
+			@$(".change-selector-from").tooltip({
+				title: "Show back to this change",
+				placement: "left",
+				animation: false
+			})
+			@$(".change-selector-to").tooltip({
+				title: "Show up to this change",
+				placement: "left",
+				animation: false
+			})
+
 			return this
 
 		onClick: (e) ->
diff --git a/services/web/public/coffee/track-changes/TrackChangesManager.coffee b/services/web/public/coffee/track-changes/TrackChangesManager.coffee
index ab27d883a1..393163c781 100644
--- a/services/web/public/coffee/track-changes/TrackChangesManager.coffee
+++ b/services/web/public/coffee/track-changes/TrackChangesManager.coffee
@@ -3,10 +3,11 @@ define [
 	"track-changes/models/Diff"
 	"track-changes/ChangeListView"
 	"track-changes/DiffView"
+	"account/AccountManager"
 	"utils/Modal"
 	"models/Doc"
 	"moment"
-], (ChangeList, Diff, ChangeListView, DiffView, Modal, Doc, moment) ->
+], (ChangeList, Diff, ChangeListView, DiffView, AccountManager, Modal, Doc, moment) ->
 	class TrackChangesManager
 		template: $("#trackChangesPanelTemplate").html()
 		
@@ -43,12 +44,15 @@ define [
 					@doc_id = doc_id
 					@updateDiff()
 
+		AB_BUCKETS: ["control", "one-week", "pop-up"]
 		show: () ->
 			@changes = new ChangeList([], project_id: @project_id, ide: @ide)
 
+			if @changeListView?
+				@changeListView.remove()
 			@changeListView = new ChangeListView(
-				collection : @changes,
-				el         : @$el.find(".change-list-area")
+				el: @$el.find(".change-list-area")
+				collection: @changes
 			)
 			@changeListView.render()
 			@changeListView.loadUntilFull (error) =>
@@ -57,6 +61,8 @@ define [
 			@changeListView.on "change_diff", (fromIndex, toIndex) =>
 				@selectDocAndUpdateDiff(fromIndex, toIndex)
 
+			@showUpgradeView()
+
 			if @diffView?
 				@diffView.remove()
 
@@ -65,6 +71,26 @@ define [
 			@ide.fileViewManager.disable()
 			@enable()
 
+		showUpgradeView: () ->
+			@upgradeType ||= @ide.analyticsManager.startABTest('track-changes-upgrade', @AB_BUCKETS)
+			@$el.find("button.upgrade").off "click.track-changes"
+			@$el.find("button.start-free-trial").off "click.track-changes"
+			@$el.find("button.upgrade").on "click.track-changes", () => @askToUpgrade()
+			@$el.find("button.start-free-trial").on "click.track-changes", () => @gotoFreeTrial()
+
+			if !@ide.project.get("features").versioning
+				if @upgradeType == "pop-up"
+					@$el.find(".track-changes-upgrade-popup").show()
+				else if @upgradeType == "control"
+					@$el.find(".track-changes-upgrade-control").show()
+				else if @upgradeType == "one-week"
+					@$el.find(".track-changes-upgrade-oneweek").show()
+
+				if @ide.project.get("owner") == @ide.user
+					@$el.find(".show-when-not-owner").hide()
+				else
+					@$el.find(".show-when-owner").hide()
+
 		hide: () ->
 			@ide.editor.enable()
 			@ide.fileViewManager.enable()
@@ -191,4 +217,17 @@ define [
 		disable: () ->
 			@enabled = false
 
+		askToUpgrade: () ->
+			ga('send', 'event', 'subscription-funnel', 'askToUpgrade', "trackchanges")
+			ga('send', 'event', 'ab_tests', 'track-changes-upgrade', "prompted-to-upgrade-#{@upgradeType}")
+			AccountManager.askToUpgrade @ide,
+				onUpgrade: () =>
+					@ide.analyticsManager.endABTest('track-changes-upgrade', @AB_BUCKETS)
+					ga('send', 'event', 'subscription-funnel', 'upgraded-free-trial', "trackchanges")
+
+		gotoFreeTrial: () ->
+			AccountManager.gotoSubscriptionsPage()
+			@ide.analyticsManager.endABTest('track-changes-upgrade', @AB_BUCKETS)
+			ga('send', 'event', 'subscription-funnel', 'upgraded-free-trial', "trackchanges")
+
 	return TrackChangesManager
diff --git a/services/web/public/stylesheets/less/trackchanges.less b/services/web/public/stylesheets/less/trackchanges.less
index b27a81802d..f9f12bbcc8 100644
--- a/services/web/public/stylesheets/less/trackchanges.less
+++ b/services/web/public/stylesheets/less/trackchanges.less
@@ -79,6 +79,39 @@
 		}
 	}
 
+	.track-changes-upgrade-control, .track-changes-upgrade-popup {
+		position: absolute;
+		top: 0;
+		bottom: 0;
+		left: 0;
+		right: 0;
+		z-index: 100;
+	}
+
+	.track-changes-upgrade-popup {
+		background-color: rgba(128,128,128,0.4);
+		.message {
+			margin: auto;
+			margin-top: 200px;
+			padding: 10px 10px 14px 10px;
+			width: 400px;
+			font-weight: bold;
+			text-align: center;
+			background-color: white;
+			.border-radius(8px);
+		}
+	}
+
+	.track-changes-upgrade-control {
+		background-color: #eeeeee;
+		text-align: center;
+		.message {
+			font-size: 18px;
+			margin: 12px;
+			margin-top: 36px;
+		}
+	}
+
 	.deleted-change-background,
 	.deleted-change-foreground,
 	.inserted-change-background,
@@ -193,6 +226,10 @@
 		}
 		li.loading-changes, li.empty-message {
 			padding: 6px;
+			cursor: default;
+			&:hover {
+				background-color: inherit;
+			}
 		}
 		li.selected-change {
 			background-color: #eaeaea;
@@ -242,6 +279,11 @@
 				}
 			}
 		}
+		li.track-changes-upgrade-oneweek {
+			padding: 15px;
+			background-color: rgb(255, 251, 210);
+			cursor: default;
+		}
 	}
 	ul.change-list.hover-state {
 		li {
@@ -256,6 +298,7 @@
 		li.hover-selected {
 			.change-selectors {
 				.range {
+					top: 0;
 					background-color: #999;
 				}
 			}