I'm having some problems with rendering in uncompressed 10 bit. I'm having both AE CS5 and CS3 installed in my machine. In CS 5 I do have the option to export to 10bit, but in CS 3 I don't. So clearly I have to right codecs on my machine, but AE CS 3 does not recognize them.
For this project I'm working in CS 3 because the client needs to work with my files too, and only has CS 3.