Many thanks for your response, Luke.
I appreciate that the simplest solution is to get a Decklink card for the other system – and I am lobbying hard for this – but there will always be instances where one needs to work on projects on non-Decklink systems and then to move back to the main system with Decklink.
For your information, we have noticed that this issue has been present at least since Summer 2004 – so that’s across both FCP 4.5 and 5, OS 10.3 + 10.4, plus various iterations of both QuickTime and the Blackmagic drivers.
Also, I should have mentioned that we’re working in PAL on both systems. DVCAM and Digital Betacam media is captured via SDI (through the DEcklink card) at DV resolution and remains in this form throughout post production.
Any thoughts that you (or others) may have would be much appreciated.