If you are seeing severe lag (strokes take a very long time to appear after you make them) while trying to draw on the canvas in Mac OS 10.11 using ArtRage Lite or ArtRage 4, you probably need to update your software to version 4.5.9 (or later). Earlier versions are not compatible with El Capitan.
If you aren’t sure whether this is the issue, go to Help > About ArtRage and check the version number. If it is earlier then 4.5.9, download the updated version from the member area. If it is 4.5.9 or later, then please contact us as you have a different problem.
Note: ArtRage Studio & Studio Pro users will also experience problems if you have not updated to version 3.5.12, but this is a pre-existing compatibility issue that has existed since Mac OS 10.9.