http://www.esportboard.de/gallery/sh...=1105&catid=37
I would make sure your using all current 2.4.3 files as Luciano suggests as it would appear you are the only one getting this error.
You can send me ftp info and admin url access to gallery to poke around if you can not solve it by all clean files.
It is rather hard to fix something when you can not reproduce the issue.