Access Denied when trying to edit Media files.

I'm not certain whether this is an issue with FIle Entity or directly with Media, but when I try to edit Media videos and images by using the "edit" links in the files table on admin/content/file, I always get an access denied error. I'm not sure this is the source of the problem, but I think it has something to do with NULL being passed for the $file parameter to file_entity_access(). Also, according to the code in file_entity_access(), the "edit" operation no longer seems to be supported (it appears to have been renamed to "update"), which may be related.

I can still edit media files by going to one of the nodes they're attached to and clicking the "Edit" button next to the thumbnail, but my users use the admin/content/file a lot, so this problem is a game breaker for my site.