Video losing sync with audio during playback

I am having a unique issue with FCP 6.0.6.
We are using this version to log and capture a switched video feed with audio
through a Black Magic DeckLink HD Extreme 3 PCI card. Capture works fine.
But during playback the next day, the video seems to drop a frame, or lose sync
(you can see it visually) then continues playing. The result is the video is now
out of sync with the audio.
We do a weekly 3 camera shoot which is webcast, and then later uploaded to youtube.
We have been running this setup for a number of years without issue, but this has started
becoming an issue the last 3 weeks in a row with no change to our setup.
The webcast does not experience this, which makes me think there is a sync issue
between my switcher and my FCP machine.
Any thoughts or ideas?
Mac Pro
3GHz Quad Core Intel
16 GB Ram
OS 10.6.8

Are you ABSOLUTELY sure there was NO change? (All sorts of problems can occur if you haven't turned off automatic updates.)
In any case, you might want to run Preference Manager from Digital Rebellion (free) to delete the FCP prefs. Sometimes they get corrupted and can cause some funky behaviors.
Otherwise, sounds like a question for Blackmagic technical support.
x

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"DarrenDoesIt" <[email protected]> wrote in
message
news:gar7d8$1of$[email protected]..
>I appreciate your help, but most of these websites assume
you're
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noninteractive
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understand it,
> the source
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