Hello,
Please check in the event logs for errors. Inform us if you find any 9's or 11's in the system event logs. Please refer to the following MS article for troubleshooting such errors.
http://support.microsoft.com/default.aspx?scid=kb;en-us;314093
http://seer.support.veritas.com/docs/255501.htm
Also install the latest veritas device drivers for BE 10.0.
http://support.veritas.com/docs/277477
And also the changer should be connected to a SCSI Id lower than that of the tape drive. Also do not connect them to Id 0 or 1.
Additional Information :
For information on the recent VERITAS Backup Exec security vulnerabilities, including links to the downloads for the necessary hotfixes, please refer to the following document:
Patch summary for Security Advisories VX05-001, VX05-002, VX05-003, VX05-005, VX05-006, VX05-007
http://seer.support.veritas.com/docs/277429.htm
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Thanks.