@Candle
I like the tgc for making outside buildings. Like specifically one section we have in in SinninSoul where a door is punched though a building face. I needed to have a sleeve that was CSG immune placed right where the door went so when the hole got punched you didn't get this spaztic uvmapping where the hole got punched. I was able to make the building and the sleeve the segment. This is kinda hard to do in Signs but easy to put together in the TGC segment creator. That building ended up being 3 pieces. The building face, one floor tile, and the sleeve to cover the CSG mess.
@Father Tree,
My bet is you have onboard graphics correct? No card or at least a very old card? Same thing happens on my other comp that has no card.
Edit: Few images to show the stuff I do in the TGC seg creator.