White page in "All Websites" - Piwik 1.12

We are using piwik for around a year to track around 700 of very light-traffic sites. Everything was working fine untill recently, when “All Websites” (index.php?module=MultiSites&action=index&idSite=9&period=day&date=yesterday) started to return a blank page. All other pages work fine, tracking also works.

No errors found in piwik nor apache nor mysql logs.

please upgrade to 2.0-beta7 where this bug should be fixed. also make sure this is setup: How to Set up Auto-Archiving of Your Reports - Analytics Platform - Matomo


we got the same Problem. We have ~800 sites and got a blank page on the MultiSite Plugin.
Every other (Plugin-) Page worked. Api, Live and so

We solved our problem without update:
we just deleted the folder “PIWIKFOLDER”/tmp and everything went fine.

thank you StephanB and matt,

cleaning the /tmp directory did not help.

I guess, I will need to wait for 2.0 stable.