YEP! Well, probably.

Tip #1: start GIMP by clicking on the icon WITH YOUR TABLET.]

If that doesn't work go in to edit=>preferences=>input devices=>input controllers. You should see a list of the 'available controllers' and the 'active controllers', your tablet should have its own. Mine turned out to be labelled 'DirectX DirectInput', I don't know what yours will be D:. Anyways, make sure that it's activated, or reactivate it. Once that's done, restart GIMP and see if that works.

Hope this helps!