Mail file not open in 8.51 client

I upgraded to 8.51 and my mail file and a few other databases could no longer be opened in 8.51 client, either by double clicking or via the “view->go to” menu.

I tried deleting cache file and desktop file, refreshing design etc, neither worked.

I created a blank database and it could be opened, but after I replaced the design to 8.5 mail template, the database could not be opened.

Subject: 8.5.1 is not yet released - do you mean 8.5? <>

Subject: RE: 8.5.1 is not yet released - do you mean 8.5? <>

Mine is the 8.5.1 beta release.

Subject: 8.5.1 Beta is only in a closed beta release…

How did you get 8.5.1?

Subject: Maybe this issue?

http://www-01.ibm.com/support/docview.wss?rs=0&dc=DB500&q1=unable+to+load+frame's+content&uid=swg21383920&loc=en_US&cs=utf-8&cc=us&lang=en