[support] 4.6 upgrade to 4.7 node access problem, OG-related?

[Chris Johnson]

We just upgraded a large site using many modules including a number of the 
Organic Groups modules from 4.6 to 4.7, and now none of the nodes are visible 
to the admin (uid = 1) user.  We get access denied errors.  Something is 
screwing up access control.  Any suggestions where to look?  We tried disabling 
the OG modules temporarily with no improvement.

..chrisxj