All of a sudden, when I try to use the spot healing brush, it just sticks on the page, doesn't move. If I switch to other tools they work fine, but the healing brush sticks. Obviously, it's very difficult to work with it. Any help appreciated.
Also, I just downloaded the latest update, and I restarted the computer, neither of which helped.
Please state the exact version number of your Lightroom (go to Help->System Info)
If you are doing a lot of brushing and/or spot healing on a photo, this is a known issue in Lightroom.