i have just compiled a nuke plugin which u can use to extract all camera information from a vray exr file. I think it'll only work with vray4maya exrs...i think max doesn't write cameradata.
Find it here.
Just plug the node named "PostlightCamera" into your read node and watch what happens
It's only compiled for Nuke 5.2 win_x64 yet...let me know if u need it for other versions.
EDIT: I just got the first crashreport. If u experience crashes too,please send me your exr if possible!