Terrain brush not matching with cursor.

Hi, The terrain paintbrush/raise/lower brush is not synced up, for lack of a better term, with where my cursor is. My cursor can be clicking away in the middle of the screen with nothing happening, and then I zoom out and notice the corner of the terrain is risen/lowered/textured etc. The effect is lessened with larger terrains but there is still a fair distance between the cursor + brush.

I have reinstalled Unity to no effect.

Here are two other threads from March and May 2012 with people experiencing the same problem. http://forum.unity3d.com/threads/126...up-with-Cursor

http://answers.unity3d.com/questions...on-cursor.html

This is really frustrating. I'd really appreciate any advice. Apologies, I also posted this in the forums before thinking it was better placed here.

Thanks,