Compressor frame count jumping back and forth

Hi guys,
I've never noticed this before, until last night when compressing a 25-minute film in Compressor at 'DVD-90 minutes, high-quality'. What in the past on this film might take an hour or so, last night took about 14 hours (i.e. all evening and through the night).
Compressor was advancing through the frame count, but then would return to an earlier frame, then jump forward through the frames again, then jump back to 10 or so frames earlier, advance forward, go back, etc. It took ages for it to get through a dozen frames or so.
It seems to me in the past when I observed Compressor, it works its way consecutively through frames, advancing forward one frame at a time.
I guess Compressor was reinterpreting data from an earlier frame, but is this normal? My film only has one of two video layers, up to 8 audio layers, some imported Motion QT files, and a very large PICT image file (scrolling end credits).
When examing the frame count where Compressor seemed to get bogged down, it appears it was towards the end of the 25-min. film (around the 42,000 mark). It seemed to be stuck there, jumping back and forth all night. Must have been when it was trying to digest the PICT end credits... Eventually it did complete the task and the export was OK.
If Compressor is having problems with the PICT (?), perhaps I'll test this out by putting my end credits on a seperate FCP sequence, export them as a QT file, then re-import that back into my film and see if Compressor is happier...
Any thoughts?

Ongoing changes? What do you mean exactly? Anytime you add filters to a clip and render you are slightly lowering the quality...slightly. But exporting, expecially via Compressor, will add even more. How many changes are you making?
Shane

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