The site has become very difficult with German browsers. Depending on the used browser I see PHP errors frequently. In Internet Explorer 8 trying to load an image there is an error depending on the image classification:
Parse error: syntax error, unexpected T_ELSE in /home/yunzo/www/uploader/upld-conf-index-de.php on line 61
With Firefox 3.6 the whole site is unusuable because the error message above appears on any page I try to open. Firefox 10 shows the pages but no images, always with the error message above. Maybe this helps to identify the bug.