Thanks for the report. If anyone else experiences this issue please comment!

We got one more report of a user who experiences problems with pagespeed mod.

Maybe we could automatically disable it via htaccess? Or maybe add a System check warning?

From Thomas:

All Websites is not working because of "Pagespeed" which adds the following script tag to an AngularJS template:

<div>that's our template</div>
<script pagespeed_no_defer="">(function(){var e=encodeURIComponent,f=window,h=document,m="width",n="documentElement",p="height",q="length",r="prototype",s="body",t="&"................;pagespeed.criticalImagesBeaconInit('/ngx_pagespeed_beacon','plugins/MultiSites/angularjs/dashboard/dashboard.html?cb=98f8a8ce3d1b407362b58a8fca72911b','_cC5oOyMsy',false,'XTfZDrF1mnM');</script>

I'm kinda sure the Angular template compiler expects to see only one element and not multiple ones. Surprisingly it works for the SiteSelector.html which includes such a script tag as well and I cannot 100% explain why it works there. Saying "It works similarly to a web crawler, by taking a snapshot of your page sans javascript and DECIDES what content to CPOMPRESS for you." here: http://www.reddit.com/r/webdev/comments/1j3lh8/advice_is_it_possible_to_use_google_pagespeed/ So it might compress some templates, some not.

Many reports on the dashboard do randomly not seem to work. Got rarely "502 Bad Gateway" and often "(failed)
net::ERR_INCOMPLETE_CHUNKED_ENCODING". Surprisingly "getNumberOfVisitsPerVisitDuration" seems to often return a "502 Bad Gateway" whereas for example "getDonateForm" and other reports often seem to return "INCOMPLETE_CHUNKED_..... And it fails only every second request or so.

The server is also quite slow in general... Maybe all related to pagespeed?

Issue in 2.8.3 when adding new website as well. The Table won't get filled due to angular js errors in the console when mod_pagespeed is active.

On Nginx pagespeed is also causing the trouble: Just wanted to confirm that ngx_pagespeed's Add Head filter is the sole reason that the Websites settings page wasn't listing any sites., reported in this forum post

We can confirm this issue. After we disabled mod_pagespeed, it worked fine again.

Here they discuss how to detect modpagespeed is running: wpsharks/comet-cache#234

I've had the same error "net::ERR_INCOMPLETE_CHUNKED_ENCODING" when serving piwik from an nginx server.
after adding "sendfile off;" to the server { .. } block of the configuration the issues where resolved.