Gnome desktop activities cannot select, No apps menu

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http://forums.fedoraforum.org – I have inadvertantly changed the behavior of my desktop and it's driving me crazy. I have gnome 3 (I think?) and fedora 15. When I click on "Activities" button at upper left and get into "activities view" (I think this is the name?), I can see all open applications (as small windows / large icons) but trying to select these with the mouse causes the whole set scrolls up or down (so I can't actually select anything but the first window). I recall that before I was able to pick any of the incons and the mouse did not move the collection. I can still choose from multiple & (HowTos)