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".
Todd. I think that your answer is leading me in the right direction. My AE comp contained a Cineform RAW file at 3840 x 2160. After stabilization, I then changed the projects settings to 1920 x 1080 and output throught render queue to a Cineform avi. But, then uncompressed avi or QT could not handle 32 bpc either.
So, I take it that I should not expect 32 bpc with Cineform?
That sounds like an issue where AE's 32bpc buffer is not properly dithered down to ther lower bit-depth of the CoDec. Could also be a simple memory issue inside the CoDec, where frames are not flushed after a while. Really hard to tell. I would definitely check with Cineform. from my own limited experimentations in the past with freely available footage, I know that the whole setup is very sensitive and in fact different versions of the CoDec work in different versions of AE...