I upgraded from CCM 4.1(3)sr2b to CCM 4.1(3)sr4d 2 weeks ago. After that I had a few phones that were set to Call Forward All to other numbers before the upgrade. After the upgrade, I had a few users who could not remove the CFWD All. I was able to pull the phone up in CCMAdmin, enter a number in CFWD All, do an update, remove the number and do an Update again and the issue was resolved. This weekend I upgraded to 4.1(3)ES94 because of a bug in 4.1(3)sr4d with 7970's. Ran into the same CFWD All issue, but the last fix isn't working this time. Been on the phone with TAC for over 3 hours now with no resolution. We've restarted the Database Layer Monitor service, the CallManager service and the RIS Data Collector service.
I'll post updates if/when I have any.