One frame offset when editing with Decklink to SRW-5500

We're using MC 6.0.1 on a MacPro with a Decklink card. When we do an insert edit on a SRW-5500, the video is offset by one frame. The edit starts at the correct place on the tape, but the video is a frame late. e.g. if we burn-in timecode on the AVID and do an insert at 01:00:00:00 the first frame that ends up on the tape has 01:00:00:01 in the burn-in.

When using the same deck and a Nitrus DX we have no problems.

This seems like the Avid is compensating for a one frame delay that isn't present??? Any ideas on how to fix things? We tried playing around with the settings in 'Deck Preferences' but nothing seemed to make any difference.

thanks!

-Andrew