TC problems with FCP Edit To Tape

Hey guys,

I'm facing trouble using the AJA IO HD (latest firmware, latest drivers / v8.0) for an edit to tape (assemble edit) from Final Cut Pro 7.0.3 to a Sony DVW-A500P via SDI/RS422. Color bars are supposed to begin at 09:58:30:00, black at 09:59:30:00, program at 10:00:00:00. The tape is blackened with a TC starting at 09:58:20:00.

Using a Mac Book Pro (OS 10.6.6) and a Mac Pro (OS 10.6.7) the ETT begins just fine exactly at 09:58:30:00. But then the bars end too early and program also begins too early. It's a matter of three frames (black starts at 09:59:29:22, program at 09:59:59:22). Before updating to the latest firmware it was just one frame with the Mac Book Pro. I used different pre-rendered FCP sequences, all Apple ProRes 422 PAL (HQ), always with the same result. In the FCP device controls I changed "LTC+VITC" to "LTC", same result. I rebooted all devices (Macs, AJA, DVW), same result.

I think this problem is AJA IO HD related, as the ETT works absolutely fine with Blackmagic DeckLink SDI.

Does anybody have suggestions how to solve the problem? Thanks a lot!