DV/DVCPRO NTSC Compression not working

When I export a sequence to QT movie using DV/DVCPRO NTSC compression (either directly to a QT movie or using QT conversion) I get what looks like a solarized effect (maybe 6 colors total) and the colors are all off - mostly browns and dark tans with hard lines between them, grainy.
If I export with no compression, it looks fine.
It also looks fine in FCP itself during edit and playback, etc.
If I take this project and clips to another machine, it exports into DV/DVCPRO NTSC with no problem.
This just started happening. It was working fine for months with the same settings.
I've tried archive and reinstall the OS system as well as trashing and reinstalling FCP. No change. Using OS 10.4.11, FCP 5.1.4.
I don't know what else to do other than wipe the drive completely. All suggestions appreciated.
Thanks
Paul

Hi Paul
in your first post you said that exporting without compression was fine, now you say that it also has issues and that exporting on another machine is ok.
1. Given that you want to go back to tape, export at your sequence settings to maintain quality; actually selecting the same settings as the sequence settings should see no difference in quality. If you are outputting the finished product back to the same tape that the footage originated from there is no need to change codec, you are better to leave it the same.
2. The fact that the export is seeing problems on one machine and not another suggests that something is wrong on machine one. Trash the prefs for FCP, run some system maintainence on it as well, eg. Disk Utility.
Tony

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I am trying to hyper compress the tonal range of a noise layer in order to get speckles, but I cannot get any of the adjustments to stick. They preview correctly, but once they are applied the image reverts to it's original state. The adjustment is listed in my history, but there is no visable effect on the image. This is true for one time adjustments and adjustment layers. Adjustment layers are I think the worst because the preview properly while live, but flattening, converting to a smart object or stamp visible all remove the adjustment. It's as if it never existed.
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I'm working on a 30 second spot that I need to upload to the cable company and they only accept .mov files. It's SD footage. It was shot and is being output as 720x480i. I tried sending them an uncompressed .mov file but they said they couldn't use it (wouldn't open with their conversion system). The guy at the cable company is telling me to use the Apple DV/DVCPRO - NTSC codec to compress it, but when I use that the footage looks pretty blurry compared to the uncompressed version.
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What am I doing wrong? Is it trying to conform the aspect ratio to what the original video size is?
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Graphics card
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ATI Radeon HD 2600 XT (standard)
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NVIDIA GeForce 8800GT (configure to order)
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Graphics card
Port 1
Port 2
Radeon HD 2600 XT
20”, 23”, 30” Apple displays
20”, 23”, 30” Apple displays, DVI to Video Adapter
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DV/DVCPRO NTSC Compression not working

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