I have this exact same issue. Veritas has been unable to get the old funtionality back for me - they did come up with the workaround of having to export tapes, then import tapes. The backup job will continue, but I don't like this method, as I can't tell which tapes in my library have been used for backup jobs yet (scratch media (overwritable) is blue, but once the tapes are written to, they turn black)
Usin their method, all the tapes show up as black in the slots view in devices.