How do I revert the actions performed with the mouse buttons to what they were before yesterday's update?

I allowed the current update yesterday, and am now unable to use a right mouse click to copy/paste text or links. I have looked through the settings, but do not see anything pertaining to the actions taken with the mouse at this level of granularity. I note that this is not a global change on my system, as right click for cut/copy/paste is still available in my editor and terminal. I would provide a screenshot, but the dialog box refuses to stay open when I try for a screenshot.