[1190] ComboD[] and/or ComboAt() are broken

Seems to be working perfectly fine now, in Build 1200.

Either one, the other, or both. Until a few builds ago, this script worked fine:

bool bool1 = false;
bool bool2 = false;
ffc script MarinOcean{
	void run(int mx, int my, int sx, int sy, int sid){
		while(Link->Item[151] && bool1 == false && bool2 == false){
			this->X = mx;
			this->Y = my;
			Screen->ComboD[ComboAt(sx, sy)] = sid;
			Waitframe();
		}
	}
}

Now, the only bit that doesn't work is the highlighted bit. It still compiles though. Other scripts seem to be doing the same thing, as well.