funny, i edited this one before and this happened to me, just merge all geosets into one (the ones visible in wc3... there are some others that i don't remember what they are, but don't go there), save and view your results.
ahh i remember that rectangle now, with the texture on it... what's it for?
what? how? it's just a plane with a texture if i remember right... are we talking about the same thing?
hmmm i have litle knowledge texturing, but why does that need to be there?