Exhcange 2013 installation error "The local domain needs to be updated", but domainprep has been run

Hello,

A few weeks ago, we ran the necessary /prepareschema /preparead /preparealldomains commands to get our Exhange 2010 Org ready to install Exchange 2013 SP1.  When we tried installing the first server today, we get an error:

[11/14/2014 23:42:02.0466] [1] [REQUIRED] The local domain needs to be updated. You must be a member of the 'Domain Admins' group and 'Organization Management' role group, or 'Enterprise Admins' group to continue.

We verified the ObjectVersion of both the Forest (15844) and Domain (13236), and it appears to be consistent with what you would expect for 2013 SP1.

Anybody have any ideas what could be wrong?

Thanks.