I dont know if this is caused by vista our my integrated graphics on my new laptop, but take a look:
the 3d window does not draw brushes within a certain distance. I have never seen this before in Radiant (maybe im missing an option somewhere) I have updated my drivers, set read/write permission to my Gaming directories, but still no luck. The next step is going to be reinstalling GTK.
Anyone have any ideas on how to fix this? IT makes level editing almost impossible.