Update: Went back to InD CS6 as a stop-gap solution. But, I have a large number of documents in CC and will need to resolve this issue within the next two weeks. Any advice is welcome.
9.2 should be out next week.
Fingers crossed that it resolves the issues. Something appears to have happened during the process of update from 9.0 to 9.1, so hopefully 9.2 will over-write what the major bug/permissions & plug-in issues.