After installing ownCloud 8/9, ownCloud hangs after login. The page is loading and the service can not be reached. All other sites work fine, so it can not be due to lack of RAM or CPU. Only after restarting the Apache2 service the endless loading can be interrupted. There are no entries in the error.log or php5-fpm.log. With the previous i-MSCP version everything works perfectly. There is also a message in ownCloud: "There was a problem with code integrity check." No files have been modified by me. This is a fresh install of i-MSCP and Debian.
OS: Debian 8.5(Jessie)