Hello Ken:
Here is something really, really strange. After I performed the steps from the document ID listed in the first thread, the robotic library was still not recognized.
I then left the server alone last week Mon and Tue. On Wed morning, I noticed that Tue's backup worked. Then, Wed's and Thu's worked fine, too. So I thought the problem went as quickly as it came. I was wrong.
I noticed on Tue morning this week that Mon night's backup did not work. Again related to the error message referenced in the first thread's document from Symantec's web site.
I removed the backup tape magazine, shut down the server, restarted the Backup Exec services, disabled the device in Backup Exec, enabled the device in Backup Exec, and now it's working again (knock on wood).
Anyway, thanks for your input on this.
Mark