Adjustment Brush tool doesn't work

[infinit...@adobeforums.com]

I got the new Adjustment Brush tool working for sometime. But suddenly it stopped working! Crazy, I know. These are the steps.

1) I click on the adjustment brush
2) select 'exposure' (default)
3) I take the mouse pointer to the portrait and click.
It doesn't create a "starting point."
So whatever changes I do is affected immediately.
-- I cannot change the exposure by moving the "Amount" slider.
-- I cannot hover over the image to see the mask

Basically, it ends up being a corel draw 1.0 software!

It seems crazy because, I got this working just a few minutes ago. (adobe crashed, and ever since I'm not able to get this feature working)

Pl help

[Wade_Zi...@adobeforums.com]

Trash the settings folder, you are referring to the adjustment brush in ACR of course?