Same big problem, but with 1 frame. Can’t offset correctly in FCP because the shift is always different.
I tested out the same playout with same settings 10 times : 4 times correct start on 10:00:00:00, 5 times start on 10:00:00:01, 1 start on 09:59:59:24.
I playout for example with the Blackmagic tool – all is correct.
I use FCP 6.0.1 on MacPro 8Core (10.4.11) with a Digibeta DVW-500P over Blackmagic Multibridge.