Sounds similar to the issue I’m currently having, are you by chance on Windows 7?

Did you find a fix to this issue? I am having similar problems, particularly with changing brush size but haven’t tracked down a solution yet.

Interesting, as I had it working great on Vista and switched to 7 and appear to be encountering the same issues as you. I assume you have the latest drivers for the tablet? If not, that would be my first stop, get that thing updated. If you ARE already on the latest driver, maybe what helped me a bit will help you. Download the previous driver version and install that one instead. In your case (if you’re on the latest driver version) I’d start with the one released in Feb 2011. If that still doesn’t help, keep going backward on the driver versions and you may find something that works better. It reduced my problem by about 80% so SBP is workable again on my machine.