Flash Frames On Incoming Video

I have the strangest problem with flash frames I've ever seen. Whenever I make a cut at a scene change in my footage I get a flash frame on the incoming cut. I immediately assumed it was a field so I lopped off the first frame and... no luck. I actually have to tim off the first 3 to 4 frames! to rid the cut of the flash.
My sequence of events: I ripped supplied footage from DVD using Handbrake & de-interlacing into an progressive, Mpeg4 file. Then, using Compressor, rendered it into a progressive, ProRes 422 HQ Quicktime. However, the ProRes 422 HQ Quicktime had this bizarre brightness change when I hit play in FCP6. It was annoying so I used compressor again to transcode the ProRes 422 files into progressive H.264 Quicktimes. They seem to play & edit fine... except for this issue. Unfortunately, this issue is a showstopper. There's no way I can continue to edit with this media doing this.
I've searched the forum for similar posts but none of the problems ever seemed solved, and certainly none of the solutions suggested are working for me; I've trashed preferences, trashed rendered files & re-rendered them, etc. I have zoomed in to verify that there are no extraneous frames. Also, if I import the ProRes 422 Quicktimes and edit with them, they don't seem to have this flash frame issue.
Anybody else seen or heard of this issue? Why would an errant field exist across 3-4 frames? Anybody have any suggestions? Any and all help would be greatly appreciated.

Handbrake is the wrong tool for this...MPEG STREAMCLIP or DVDxDV Pro are the better options. I use DVDxDV...REALLY good with non-Hollywood movie type DVDs. Can extract to DV or Uncompressed...whatever you need. MPEG-4 like H.264 isn't meant to be used as an editing codec, it is designed for final delivery. That might be why you are getting the odd flash frames...the way it is compressed.
As for ProRes brightening...that means that your system needs to reduce the quality of the image in order to play it back without dropping frames...that is one symptom. Another is really low quality playback. To see what you really working with it is good to have a capture card and external monitor connected so you can tell what things really look like...as the computer monitors are playing back a low res proxie.
Shane

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a
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Flash Frames On Incoming Video

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