The most likely cause of jittery lines is driver issues or a snap to grid/perspective option (which is easy to check for if you're using those features). To check for driver issues, go to Input Settings in preferences and DISABLE both Wintab & Realtime Stylus and restart ArtRage.

If the jitter has stopped, it was a driver issue. Turn on either Wintab or Realtime stylus and see if it works with just one enabled (they were probably conflicting, but you might need to test both to find out which one works for your system).


If it doesn't go away when you turn off the drivers, can you provide an example/description of the type of jitter? E.g. a picture? Does it matter what tool you're using?