Okay, I have reccently downloaded the "Star Wars Battlefront 2 Mod Tools."
The ZeroEditor works fine. I can add objects and do whatever I please.
But- once I finally finish a map and MUNGE (in this case, I only added objects), and I load it in SWB2, it crashes as soon as it finishes loading.
If I DON'T MUNGE it, the map loads but it's just a huge plain.

Help would be very appreciated.

could you add your error log which is in the gamedata folder of bf2??

I don't have one. Unless it's called something else, I don't have a type of file called Error Log.

Put BF2_Modtools.exe in your gamedata folder, run it, and test your map on it. The new text file that appears (should be BF2log) is your errorlog. Post it here.

The BF2 Modtools.exe is just a windowed version of BF2.