Using Windows 7 In PS CS6 tried 32 bit and 64 bit for the Adjustment Brush. What happens in Camera Raw if I click on the Adjustment Brush and use either the New or Add option I would get either a cross or a double cross and if I hold down the mouse button a very light white would appear on the area I move the mouse over. The Erase option works fine where the dash circle appears and am able to erase.
On my laptop all 3 functions of the Adjustment Brush work fine.
Did you try some extreme adjustments to make sure? If it's showing the "white fog" that almost certainly means it's working.
Thank you Noel. I realize I posted in the wrong forum since I have posted in the Camera Raw forum. Thru trial & error I found out my brush size wasn't big enough that's why I was getting those crosses for my brush.
Now I just have to learn how to use the Adjustment Brush.