Localized brush tool does not function in 2.1

Question

Greetings All,
This may have been discussed previously, but I have just registered on the Forum, and I opted not to search every topic.
The Adjustment Brush in version 2.1 still does not function properly on my computer. I cannot see the mask, and the tool takes forever to register a change. For example, I will try to paint in an adjustment--nothing will happen, and I try something else. Several minutes later, the first adjustment may register. This extremely long delay--and not all the adjustments I attempt even register with the system--makes it all but impossible to use.
I love Lightroom. The adjustment brush would be a great feature--it's probably the single reason why I upgraded to 2.0. However, the bugs have still not been fixed.
FYI, my computer runs XP on dual 3.19GHz processors with 4 Gigs of RAM.
Hoping Adobe will fix this,
Jim

Answer 1

Richard,
Thanks for the "O" tip. It makes the mask visible. Unfortunately it still does not make the tool work correctly. Maybe with the next update . . .
Jim
Chris,
Thanks for the tip on the nvidia cards. Unfortunately, I do not have an nvidia card. I actually tried to upgrade to an nvidia card. Called them, called Dell. Everybody said it would work. Card arrives and it's twice the size of the available slot. Ah well . . .
Jim