Prudential Suddenly Does not Recognize Account

Last weekend (July 30), after many months of working properly I suddenly received a message "an error has occurred" after an OSU.  Occasionally I will also get "your institution does not recognize this account" OL304-A.  Have tried the usual fixes - deactivate and reactivate the account, check account access directly online (yes, it is still there and same credentials).  Have also tried the trick listed in a discussion group about using your SSN instead of UN, but did not solve the problem.
1) Anybody else having this issue?
2) Any ideas on a fix?