Ctrl+Tab not working

Having an issue with the navigation keys. When I first installed Studio I could Hold Ctrl and tab through the active windows, then on releasing the buttons I would move to that active window. Now when I press Ctrl+Tab the list will come up, but wont jump to the screen I end on. The quick link window will stay up and the only way I can transfer windows is hitting Enter or clicking on the desired window with my mouse. Any ideas on this "seemingly simple" issue. I went through all of the Tools -> Options window with no luck.Moving to the tools group.