When running CPUU (Client Profile Updating Utility) against a switched user the following is displayed in the CPUU log.
7/12/2016 12:28:08 PM 12236 [Trace] Calling MAPILogon procedure.
Unexpected exception. Thread ID: 11276, Exception code: 0xc0000005, Exception flags: 0x00000000, Exception address: 0x69896e0e, Description: EXCEPTION_ACCESS_VIOLATION
Stack: 005E9752 GetProfileStringW RtlKnownExceptionFilter RtlInitializeExceptionChain Ordinal1022 Ordinal968 Ordinal968 FCrossForestUser FCrossForestUser HrGetAddrBook HrGetAddrBook HrGetAddrBook DllCanUnloadNow HrCreateOlkAsyncTask HrCreateOlkAsyncTask Ordinal256 Ordinal683 Ordinal1129 Ordinal637 Ordinal683 Ordinal1031 Ordinal1077 BaseThreadInitThunk RtlInitializeExceptionChain RtlInitializeExceptionChain
7/12/2016 12:28:14 PM 1696 [Error] The Client Profile Updating Utility process crashed.