Hello Andrew,
This error occurs most of the cases if the Job queue is corrupt. Please do the following to resolve the issue
1)Stop Job engine
2)Move 00000001.QSD folder (X:\ARCserve) off of ARCserve folder
3)Start job engine
Test if you can open Job status screen
4)Go to backup manager
5) Click on File menu and select open - Open a file from Moved QSD folder
Test this job if this is causing problem, if so start from step 1. That means that this job is faulty.
Repeat the same till you delete all the jobs that are corrupt.
If all jobs are corrupt, recreat backup jobs
Thx
Pat