What I have found is that if I stop and restart the RDXmon, I am still not able to eject the drive. If I stop the Backup Exec services, I am not able to to eject the drive. If I restart the Backup Exec services, the drive is allowed to eject. The Exchange Granually Recovery feature may be an issue and I am testing that out over the next couple of days.
I also creates a simple script and scheduled it to run every morning to restart the backup exec services in order to release whatever isstopping the eject from working.
REM - Stop Backup Exec services.
C:
cd \
cd "\Program Files\Symantec\Backup Exec\"
"C:\Program Files\Symantec\Backup Exec\bemcmd" -o503
REM - Start Backup Exec Services.
"C:\Program Files\Symantec\Backup Exec\bemcmd" -o502
This is Backup Exec 12 and RDXmon 1.16.