That was one hell of a day! Since I recently hit the limits of my hosting package in terms of disk space, I decided to upgrade to a 50 GB solution. Additionally, my old server was running on a SuSE distribution which had a lot of flaws. So today I finally installed a fresh Ubuntu and tried to migrate all the data from this (and other) domains. It was a real pain in the ass and it took much longer than expected, but anyway, here it is, running fine again!
The other news: I got a few new Issues and the Media section is back again. Yay!