Last modified: 2007-06-25 13:40:06 UTC
When uploading new version of image and filling new description, this description is not saved. I think I had the same issue with license tag as well. (not tested recently though)
If this is supposed to be a feature, then updating upload page ( index.php?title=Special:Upload&wpDestFile=... ) should NOT contain such items for filling since it's confusing.
*** This bug has been marked as a duplicate of bug 4636 ***