After I pressed the "Add To My Profile" button, it says the upload was complete, but I don't see a cover on my profile!

This usually means that our application has timed out with the Facebook API. Please deauthorize this application in your privacy settings and try again in a few minutes.

A black image is being shown after I uploaded my own custom cover.

Similar to the question above, this usually means that our application has timed out with the Facebook API. Please deauthorize this application in your privacy settings and try again in a few minutes.