I tried the add to target method but the dialogs are the exact same. I didn't get the same error as the other poster, I select the tape library, then it asks for the tape drives with a blank dialog. If I add both tape drives first the same still happens. Perhaps I'm doing something incorrectly, more...

I have the same issue, with a Overland NEO changer.

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Will deliver a log bundle.

Note presenting the individual tape drives works fine, but that's not terribly useful to me at this point, I need the library changer