Nocturnal Stables said:
Most of the times this has happened to me it has been sufficient to update or re-install the driver.

I would try checking once more that everything is up to date and of course restart the computer and check if the settings in both whatever program you use or the tablet could be the issue.

Another thing you could check is if windows ink are messing things up. I had mine disabled a while back because it was just being a pain :P