I am having the same issue. Using BackupExec QuickStart ver 10(d). I have checked the overwrite settings in three areas:
1) Tools | Options | Media Management - over write protection set to "None", Prompt box is unchecked.
Media overwrite options radio button is set for scratch.
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2) Under Media tab, the media set properties are set on Overwrite (none), Append Period (infinite - allow append)
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3) If I check properties of each and every tape in the media set - individually - they all show
Overwrite protection until: "Overwriteable"
Appendable until "Infinite - Allow append"
All tapes in the media set are in the Media set.... i.e. nothing in retired, scratch, or imported.
But whether I run a test job immediately, or a scheduled job, I get "insert overwriteable media."
Personnally I think the QuickStart edition is faulty. Is anyone having any luck with it?