Possible related error is no thumbnails appearing for some files, until I change the arrangement, then it's temporarily back to normal. Couple of times, video files didn't play sound since this problem appeared, but that problem went away quickly.
Using Windows Vista, Firefox as browser, VLC as primary media player. Switching to other browsers doesn't solve problem either.
Edited by EricErik, 10 July 2010 - 09:11 PM.