Max2016+SP1+EXT1+Win7P64bit CoronaRC2
WIth IR on, and adding object to a group it causes max to crash (save on way out)
Works on Any scene
Make two cubes
make scene use material override
put box one in group
exclude group from material override
start IR
attach 2nd cube to excluded group
= Max crash
must seem terribly obtuse but we use it alot for scene massing to get windows and trees looking different from override.