Empty Fields in NetBackup Detailed Status

We're running NetBackup 7.5 on our master and Exchange client, where I'm doing a mailbox-level backup, which runs for a long time, but they've seemed to have exceeded the longest it's ever run (it's going on 90 hours now).  When I'm looking at the detailed status in the java Admin console, I see that the "current kilobytes written:", "Current Files written", and the "Current file" are all blank.  The status does say that it's still writing.  Is there any way to verify that it actually is still writing data?