My new pen tablet works well except when I try to use the paint brush tool. I was using NIK Color effects pro plug in and when I select the paint brush mode it didn't work. So I just tied the paint brush tool without going thru NIK and it still didn't work with the pen tablet. There must be something I haven't set correctly but can't figure it out.

Other tools work just fine such as the patch tool, etc. Any ideas?

try reseting the paint brush and download the newest driver from Wacom