I did not see this bug in 12.04, but I do see it in Quantal. if I hold alt-tab long enough to see the switcher, it does not happen, but happens every time I do it quickly. My guess is that switcher is launching as I release the keys, it then shows up enough to take focus and realize the keys are released and goes away leaving focus in limbo.
I have not had gnome3 PPA's on either installation. My 12.04 was in place upgrade from each version since 10.04, but my Quantal is a clean install but keeping the /home.
I did not see this bug in 12.04, but I do see it in Quantal. if I hold alt-tab long enough to see the switcher, it does not happen, but happens every time I do it quickly. My guess is that switcher is launching as I release the keys, it then shows up enough to take focus and realize the keys are released and goes away leaving focus in limbo.
I have not had gnome3 PPA's on either installation. My 12.04 was in place upgrade from each version since 10.04, but my Quantal is a clean install but keeping the /home.