I'm using a Windows 10 computer, and my Right-Click is not working.  Is there a fix for this? 

Yes, there is a setting within Kartia that you can set that will allow the Mouse Click to be recognized within Kartia. Please follow the instructions below to make that change.

Once you have Krita open, in the top ribbon, [1] select Tools and then [2] select Configure Krita...

Then [1] select Tablet Settings, and then under Tablet Input API, [2] select Use mouse events for right- and middle-clicks.