CS4 brush tool is a few pixels off

Hello. In CS3 when I used the brush tool to clean up masks, I could put the edge of the round cursor on the edge of the subject at hand, and when I clicked the mouse, the brush would land right where I placed the cursor. Now, in CS4, the brush mark ends up like 5 pixels away and to the bottom of the cursor. So, it is extremely hard to be accurate. Sometimes, if I delete my preferences, it works fine, but at some point, it starts doing that again.

Any insight would be appreciated. I am running photoshop on a new Mac Pro tower, 4 core.

Thanks!

CS4 brush tool is a few pixels off

you created a new document in full screen mode use the F key to cycle through the screen modes and everything will be back to normal.