If you're logged in and load the add cover art page, and then something happens which causes you to be logged out (e.g. leaving a window open and having your login session time out), the uploader does not detect that.

Steps to reproduce:

• Load the add cover art page while logged in
• Open a new tab and log out
• Upload cover art on the first tab

Expected result:

• Refuses to upload anything because you're not logged in, or at least fails when trying to submit the edit.

Actual result:

• Cover art is uploaded to the IA servers, the uploader then attempts to submit an edit, claims it was successful (even though it wasn't) and takes you to the cover art page, which has no cover art.