We agree with you hockeykid. We've had issues using another mod as well, so it seems it's related to the Dark Egypt false walls and floors entities. Other packs and such we use work fine. At least we know what needs to be checked when a build is completed.
On a side note, we were really impressed with the Fenix mod. My wife has integrated video and her frame rate on a build was 11 fps. After installing Fenix mod, it jumped up to 38 fps and she was drooling on the keyboard

My system has a descent video card and the fps went right up from 60-120

I was done the level before my coffee was ready.
Thanks for all your hard work.
Cheers