What WhiteShdw means for the "hang" is what part of the compiling process does it appear to be stuck? Is it the BSP, VIS, or LIGHT stage? Also, anything first put into a map is structural, which acts as a solid texture that encloses the map from the void. Anything that doesn't come in contact with the void should be made detail, and I can't remember the key combination, but I believe its shift+k or something or shift+m, someone help me out here.
Shut yo face before I punch you in the mouth, break your teeth and call you Snaggle-tooth.