Probably a simple fix...
In unreal Ed... my pc wont let me subtract or add any brush. Im sure its a vista problem. i followed the same steps to just make a simple room on an xp pc and it worked perfect. it has to be my vista 64. i click... the button moves in and out... and simply nothing happens! i oped a new level and made it "subtractive" and tried multiple times to subtract masses with instructions i KNOW work for a fact. help 
pentium 2160 1.8 watercooled and overclocked to 2.4
4 gigs pc 800
9600 gt
Vista Ultimate 64 bit OEM
200gb hd
600w psu
pentium 2160 1.8 watercooled and overclocked to 2.4
4 gigs pc 800
9600 gt
Vista Ultimate 64 bit OEM
200gb hd
600w psu