Mac or windows? What version?
What exact version (x.y) of Lightroom?
What are the exact steps to reproduce this problem?
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With the adjustment brush activated, check the density and flow settings. If they are set too low then it will take a lot of brushing in order for the effect to be seen.
Happens from time to time on mine too. You can select the adjustment brush, and nothing happens when you apply it on the picture. Restarting lightroom fixes it until the next time. Lightroom is very slow and buggy, even with a powerful computer.
5.8. I use a Mac. The things suggested below for not work. It is like I can whiten teeth now. But I can use contrast with the adjustor brush or exposure. When I do it will light the whole picture. Not the one spot.