If you downloaded the zip file yesterday, some outdoor areas will be fouled up. I'm afraid there was a stupid little error in TUCQextras.wads, which is entirely my fault. In a Sarah Palin moment, I deleted the dummy texture at the begining of the texture list. That caused the next texture in the list, ASHWALL, to become the dummy texture, so any wall or flat using ASHWALL will be fouled up. (I was rather surprised earlier, when I went into an outside area and found most of it to be invisible!)
I have gone back, fixed the problem, and reuploaded the zip file.
If you downloaded the file before today, download it again to get the fixed TUCQextras.wad.
Otherwise, you're okay.