Don't click where the click to cure icons are
Click on the health or power bars instead
If that doesn't work for you then yep uninstall the group window.
Note: To those that have the abilities simply click on the icon of the effect to cast a cure on that groupmember.
As for the reported interrupts: All it does is send a useability curearcane and so forth so not sure where the interrupts are coming from as all the game would do is tell you that you don't have that ability...