Synthetic full backup never completes.

I have taken a successful Full and incremental backup.

When I am running a synthetic backup it never completes. I cancelled the job.

Now when I check the backup images from BAR gui it shows me a Synthetic backup also.

How can I verify that image is not corrupted. Or why the Synthetic backup runs for a while and never completes.

Netbackup version is 7.1.0.3

Opersting System is 2003