http://www.doomworld.com/idgames/index.php?id=15386
With Dudu's Le-Guns3 loaded
http://rapidshare.com/files/141389332/Le-guns3.rar.html
When I noticed some rendering glitches. First of all, I noticed that the sky was showing through some places where it shouldn't:

And here's how it should look.

Then later on I noticed that the replacement graphics for the teleport flash were showing with a white background.

Although they had been working earlier in the level.

I quit and replayed the level without Dudu's guns and it was fine. Then I went back to Dudu's guns and the glitches returned.
I've also attached 2 save games (I think I zipped the right ones). These are from near where the glitchy screenshots were taken.