Renders 8 and 16 bit but not 32

I am attempting to render out a one minute 1920 x 1080 stabilized clip through the render queue. The stabilization was done in CS4, not Mocha. I can export the movie in 8 bit and 16 bit, but once 32 bit is activated (with or without color management) the encoding stops part way through and returns me to the interface. Does not matter if I encode to QT or uncompressed avi. It just won't do it.
Am I missing some step?
AE CS4 Vista 64bit i7 920 Intel 12 gigs ram. Multiprocessing turned on and 2.8 gigs per core assigned. Seperate RAID 0 media and system drives.

Are you saying that you're trying to export a movie with 32-bit-per-channel color? If so, what codec are your trying to export 32-bpc color to? And why?
There are very few codecs that support 32-bit-per-channel color.
For some background on color bit depths, see "Color depth and high dynamic range color".

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