Thread:Project:Support desk/Problem producing GIF thumbnails

My site seems to be unable to generate valid thumbnails for GIFs at the moment. The output file is just 10 bytes in size. It can produce thumbnails for JPEGs. I haven't tried other file types. Existing thumbnails are, of course, ok. If I use ImageMagick convert from the command line it generates correct GIF thumbnails but MediaWiki seems unable to do so. Any thoughts as to what might be wrong?