I wound up having to do a "forced" restore from backup. Took FOREVER, and I got a SECOND error message that Itunes had been interrupted - I did not touch anything! VERY unnerving. However, things SEEM to be ok for now. I did NOT allow the update to icloud yet, until the issues relating to MM are resolved.
BTW: my son also had an error during the restore of his phone. -50 I think.
Jeeeeeezzzz!