I just bought a new Dual G5 complete with Tiger and I get this same problem. Whatever the output method, Whatever the simplicity of the animation, whatever rendering configuration, It always freezes at some point in the Batch Render process. This happens in 6 as well as 6.5.
Has any one yet figured out what this results from?
I have found the only work around to be to Batch Render with the Maya Software closed. Though this works, it's still fairly annoying!
I dont think a clean install will work for me since this oviously already was.