I searched the Audirvana Forum/Blog for the answer and, as I didn't see a similar problem there, I wrote to Support. This is the first issue I've had with their "legacy" software but, if I have another, I'll follow your advice and post a question on the Forum first. Anyway, I'm sure the company's support site is inundated with questions so I was happy to get a response...and it seems to have worked.
Thanks,
Keith