If I have an object in the scene selected and I deselect it, it will freeze Max for about 3 seconds. However, this only happen when I have the either the modify or hierarchy tab. Things I've tried:
I'm using 3Ds Max 2015 64 bit
Reset UI to default
Installed service packs 2 and 3, I already had 1 installed
Using different types of objects, splines, editable polys, etc. It happens with anything.
I can't seem to repair my max installation for some reason.
I have a feeling this problem started when I was experimenting with the redshift renderer for Max. I tried uninstalling it and am currently rendering withthe default scanline renderer, but the redshift option still shows up even though I uninstalled it.