@mazi:
1. i re-uploaded all files in binary mode
2. the error messages were "admin/listcolumn.php" & "admin/scripts/fckeditor.266/editor/skins/silver/images/toolbar.buttonarrow.gif" already exist (as a 0kB file, I replaced it) --> should be no problem
3. where do i check mod_security? and should it be or not?
@shnoulle:
tuschefueller.com doesn't work because i moved it to another domain for reuploading, server remains the same. what's bad about that line?
[edit] for the record: the error messages are still the same [/edit]