Okay, I worked it out.

I did some investigation into the error, and I found an interesting comment by oOo:

"I have seen this before in GameCaves example and in the Stealth game's source, but this one is good too. This doesn't work in gm7, but its easy to fix. I think all you have to do is remove the d3d functions."

And he was right. Apparently the d3d functions were an exploitable feature, and GM7 fixed this.

Hope this helped someone as much this helped me.

So yeah. The abandoned project has been recovered and I'm starting it again. Hopefully I'll get it somewhere good this time before I have to stop again.

If I get this anywhere, I'll be sure to post at least a good screenshot to show you how it's coming along.

(All hail the Gamecave engine! =D )

Life in itself has been pretty crap, but getting better. Hopefully this sudden inspiration I got to start this project again will hold out.

But for the most part, I've just been playing 360. =P