If you can interact with the menus and buttons, but can't make any marks on the paper, or can draw fine but can't use the menus properly, then the problem is usually the tablet driver settings.
If you are using ArtRage for iPad or ArtRage for Android, make sure that you haven't set it to ignore touch input from your finger or use a different stylus.
If you are using Windows, then the issue is usually tablet drivers. Go to Edit > ArtRage Preferences > Input Devices.
If both Realtime Stylus and Wintab are ticked, this is almost always the problem (ArtRage tries to autodetect the one you need to use, but if the tablet driver or operating system sends the wrong signal, ArtRage can't use it and appears to not be responding). If only one is ticked, you might need to change to the other one.
If you are using a separate graphics tablet to draw on (or a mouse!), turn off Realtime Stylus and restart ArtRage.
If you are using a touchscreen device (e.g. a Cintiq or Surface Pro), turn off Wintab and restart ArtRage.
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