Some mouse drivers on some machines in the presense of some helper applications report the scaling of the tablet coordinates incorrectly.
To correct this, you can select 'Use Mouse Mode' from the preferences menu. This uses the mouse coordinates as reported by Windows, rather than as reported by the raw tablet packets.
In case people are wondering why we use raw tablet packets... Most tablets are able to report coordinates at a much higher resolution than screen coordinates. However, given that ArtRage now supports canvas magnification, which allows more accurate placement of strokes while still using mouse coordinates, I'm considering tossing out the processing of Tablet packets and just using Windows mouse coordinates by default. It would save a whole bunch of confusion.
See the attached image for how to access the 'Use mouse mode' option in ArtRage.
AndyRage's mantra for graphics engine code:
"Sure - how hard can it be?"