I think this thread goes here, as I don't think it concerns the Source engine itself, but anyway; In the SDK, when the cursor doesn't show up in the 2D views when I'm using the magnify tool, and also when I hover it over the circles at the corners of the selection box when I try to rotate a brush.
Also, nothing is showing up in the 3D view for HL2 engine games. I've tried using the atioglxx.dll and the opengl32.dll, and the 3D view works fine for Orange Box games. What could be causing either of these problems?