a client received this error

Fatal error: Exception Code=C00000FD

which is one i think have only seen once before. The line was a Pack Database command. Interestingly enough afterword the client could not get back into the system at all... upon copying their data to my local drive the dbc was validated the entire system reindexed and then sent back to the client who then had no problems.

anyone seen this before? Thanks in advance...

Glenn