Comment 17 for bug 397192

It seems to me this is a problem that occurs when a file is moved. I've had the same issues with pdf, tga, etc.. All thumbnails will load fine if you move the file back to the original location. The problem tends to happen occasionally if you drag the file to the new location. Using cut and paste (as far as I can tell) doesn't cause the problem. (-still testing this since the problem occurs randomly) Once the problem occurs I can never get the file's thumbnail to work correctly no matter where I move it. (Unless I move it to the original location)