I don't think i have seen a case where the file got corrupted and couldn't be opened when this happened.
But, to play it safe one maybe shouldn't save when this has happened.
The storage manager is "the registry of NX", where NX keeps track of all objects.
and as Tingsryd says, if one runs NX for a very long time, this can happen .
( - the same reason why one must shutdown windows completely .)
And, you probably cannot repeat this error.
IF you can, Call GTAC.
Regards,
Tomas