Random jump in brightness when rendering

Mac OS10.4.11, QT7.5, AE CS3, running on a Quad G5.
Ever since upgrading to CS3 (8 months ago) I have been having a problem with renders. The rendered video will display a jump in brightness. This happens several frames after the start of the render, but it is random when this will occur....I have tried re-rendering the same movie and the point at which the error happens will change.
This happens regardless of the video codec being used, i have tried it with colour management on and off, and i have tried using 8,16 and 32 bit projects.
I don't use (never had) the open gl settings, so it can't be that.
Any ideas what the hecks going on ? and what to do to solve the problem?
adam

yes - i'm using 8.0.2.
Not tried either .avi or targa.
Nt too sure what ou mean by specific set of colour profiles - I tend to set the colour management options to the HD TV set (its not in front of me right now, and can't remember the exact terminology). However, i have also tried it with SD TV and without any colour management switched on at all.
I work exclusively in 10bit uncompressed Pal, but the problem has occured with various codecs including QT animation (with and without alpha),
I have switched off the multiprocessing option, and will give it a try next week when i'm back at work.
thanks for the suggestions
adam

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