Yosemite repeatedly tells me to open system preferences to give control to RightZoom but it is checked in system preferences. Whats the matter?
Visit the Privacy tab in the Security prepane. Click the lock icon and enter your password to unlock it. Select RightZoom in the window (don't bother with the check mark at this point) and click the minus (-) underneath the list. Locate the RightZoom application icon wherever you keep it on the computer, and drag it into the list you just deleted it from. You couldn't do that in Mavericks, but it makes the process work better in Yosemite. That way, if the permissions associated with an older version of the package or one that's gotten misplaced on your hard drive, you can set it right. Just be sure that the one you dragged is the one you're using.