K so my map has a bombed out bridge, and I was using the hoth_temp_destroyed_ion_core as a prop ( I changed the class label to "prop"). Now, when I place it in the map and I walk to it, I go right inside it and the map crashes. It also crashes if an AI does this too. How do I make it solid?

Check the mshs' .option file, it should have something in the way of -nocollision, just delete that line.

That shouldn't cause your map to crash, though, should it?

umm I can't even find a msh.option file for it o.O

EDIT
bump?

A one-day bump?

If no one has replied yet chances are this is a problem tha tno one really knows much about. I've had quite a few of those topics myself. I myself sure have no idea what's causing your issue.