Timecode offset when rendering DPX to DPX

I'm working on a project where the source material is DPX files with 24FPS timecode. When I render back to DPX files, there's a slight offset in the timecode written in the DPX headers of the rendered frame, anything from 1 to 5 frames off. Is this is known problem? Is Color trying to do some 23.976/24 fps math on the timecode, which it should not do?
The workaround for now has been to write some Perl code to extract the original timecode from the source DPX sequences and stick that back into the header of the rendered frames.
Thanks,
JF

Are the "In" frames correct -- and just the time code that's wrong?
How was the timeline constructed? Was the framerate determined by the import or a user setup?
jPo

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