I experience the same issue with login for my Google Apps accounts migrated to full Google Account status.
The Atom feeds continue to work, displaying unread count and Growl updates. Switching to an account causes the sign-in issue Brent described. I am able to access my Google Mail accounts through a web browser without issue. -- You received this message because you are subscribed to the Google Groups "mailplaneapp" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/mailplaneapp?hl=en.
