Color hue shift over alpha

Here's another issue we're having
This might be a FCP question, but I figured I would try it here as well.
The titles that I and my other editor have created are producing a shift in the hue of the clip they are playing over. Once the playhead hits the titling clip, the alpha channel seems to create this shift. This is happening with titles created in Motion, as well as Live Type, which is why I think this is a FCP issue, but I figured everyone in here is very knowledgable and quick to respond.
The clip is a 1920x1080 HD upres of 24p SDI capture using a Blackmagic SDI capture card.
Many thanks in advance.
-G

Here's the steez.
The color corrected clips used in the FCP project are SDI captured 24p up-resed to 1920x1080 HD. The formating for the up-res is 10 bit YUV, but the sequence setting and render files for the graphics are in 8 bit RGB, so when the playhead moves over the 8 bit alpha, it converts 10 bit YUV to 8 bit RGB, hence the hue shift (it makes it look a bit cooler).
So we changed the sequence settings to 10 bit YUV and have been assured by our online post guru that's helping us that when we do our final export, FCP will figure it out. Sorry I can't be more specific than that, but this is third hand information.
Hope this helps someone:)
-G
1.6 GHz G5 1.5GB RAM   Mac OS X (10.4.3)   Final Cut Studio

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