Ok, so the problem is this:
I try to select a face in hammer via the 3d view, and say i have multiple brushes, one in front of the other, so i click on the top brush, yet the on in the rear is selected
Click -->   <–gets selected
So i click on 1, yet 3 gets selected.
Any ideas on what might be causing this? I have re-installed Source SDK
Thanks in advance for the help!