Visual Studio Ctrl+Tab Sticking

I use Ctrl+Tab inside VS to move between different source files…one day I noticed that when I Ctrl+Tab to the file I wish to view and simply let go of the Ctrl and Tab keys it just sat there, I needed to hit enter to confirm the selection.  This started to get annoying other people had mentioned similar problem.  It seemed to happen when I was training, and finally the penny dropped…..On Windows 7 I use the magnifier via Windows Key and Plus, to highlight bits of code, and then use Windows Key and minus to revert back to normal resolution.  The Magnifier app continues running, it appears that with the magnifier app enabled I have to use Enter to select my file without Ctrl+Tab just works fine…

So now I close the magnifier app so that Ctrl+Tab continues to work.