UPDATE
[2011-12-14 22:07:54 | Aaron Culich]
The new InCommon certificate has been rolled back to an older Entrust cert. If you accepted the InCommon cert earlier today it may now prompt you again about the Entrust cert. In both cases it is okay to accept the certs, but it may have resulted in some confusion or some understandable concern.
Resolved as of 2011-12-14 22:01:00