I'm working with Cineform support (hopefully) to solve this. I did a multi camera project with two cameras Canon 5bMk2 and a t2i both converted full sixe from MOV to AVI before bringing into the solution.

It plays great in the editort but when I render and it gets to the first transition to the first camera it crashed during the render.

Interesting... I've heard of someone else with some transition issues. I wonder if it's more of a transition issue than it is a codec issue? Or maybe only issues with certain codecs?

Ed you know what it is - Cineform Neoscene converted files make my Pro 10d crash immediately on render with
Problem: Unmanaged Exception (0xc0000005)
Fault Module: C:\Program Files\CineForm\Tools\CFHDDecoder.dll
Fault Address: 0x03787FE3
Fault Offset: 0x00047FE3

I tested a small conversion and bam!! crash immediatey on render the same MOV file renders fine.

I upgraded to the latest greated Neoscene which i was told was the one I needed to work with Pro 10d.

Missed a deadline after being in email/ftp with Cineform support all day and they don't have a clue and just went home and i got out of office replies after that......ARGH!!