I am trying to see who else is having trouble with Minti mail here http://www.minti.com/questions-and-answers/discussion/715829/anyone-still-having-problems-with-the-minti-mail/ 

If you don't mind, can you answer there?

Clear your cache if you haven't done it since the last upgrade.  Les had this problem with his own website, no banner across the top, but when he cleared the cache, it went back to normal.  The computer holds/caches the old format and when upgrades are done, the computer doesn't like it.