A few days ago, Wacom released a new version of their drivers, 6.3.13w3.
It would seem that on MacOSX, these drivers can bring lot of troubles, wheter you use an Intuos, Cintiq 27 or Cintiq 13HD : a few examples here, here, here and here (the last two are mostly related to Photoshop, but there's a possibility that other software may be affected).
While Wacom may be developping a new update, I would not advise you to use the 6.3.13w3, but to stay on an older version.
I'll keep this topic updated
