Thread:Project:Support desk/Intermittent "No file by this name exists, but you can upload it." problems

Hi, I have a mediawiki install and I'm getting this problem fairly frequently. A user uploads a file, but the resulting page says "No file by this name exists, but you can upload it." at the top, even though there's an entry for the file in the database and the file exists under the image directories like the others. I've tried deleting the page, deleting the file, re-uploading, but nothing works. Any suggestions? Here's an example of the problem: http://php.med.unsw.edu.au/cellbiology/index.php?title=File:CYK4_in_Central_Spindle_Formation.jpg

Thanks!