When you open the Pie menu and go to 'Buy' the game freezes.

whut?

I've got the same problem back then. It happened right after I instaleld a certain mod. However, it went fine again after I removed the mod.

Not helpful unless you tell what mod.

I found that it does this after you buy certain weapons and units. Giant Clone and the SRC Uber Blaster both will freeze the game. The Giant Clone does it when you click on it and the Uber Blaster does it after you've ordered it once and then try to open the menu.

And the Dummyz (nowdays known as the Scavenger faction) older version (was it v1 or v1.25 or something) freezed too when you went over the kamikaze dummy.

Found something. I ran CC with the activities.ini that comes with the Diemos mod, it freezed once you select buy menu.