I've been experiencing constant crashes when projecting an image from a standard light with rectangular shape, to simulate caustics.
Every time I move the light in the viewport, IR crashed and with it, also Max.
I managed to eventually get the position of the light where I need it, but I had to stop IR each time I wanted to adjust the light and restart it, (particularly for movement.)
I resorted to standard lights for this instead of a a corona light, because the bitmap projection wasn't casting anything in the Frame Buffer using a rectangular corona light, for some strange reason.