When I try to Upgrade from 5.0.13 to 6.0 accoring your manual (http://doc.owncloud.org/server/5.0/admin_manual/maintenance/update.html) with MySQL as persistence layer, the installation fails. The screen shows the upgrade Screen showing "Aktualisiere ownCloud auf Version 6. Die könnte eine Weile dauern". In addition, a red marker says "Bitte laden Sie diese Seite neu". Nothing more happens. No errors, no "Wartungsmodus eingeschaltet", no "Datenbank aktualisiert" etc. After 5 Minutes of waiting, I reloaded the page. After that, my installation is broken, getting a blank page in the browser. I follwed strictly the upgrade instructions.
Any idea?