I have a very similar problem, I guess it's the same problem, but I think I better report it anyway.
I upgraded from Gutsy to Hardy the day the Hardy beta was released. When I was still on Gutsy I changed the keyboard layout switching key combination to alt-shift. After upgrading to Hardy the key combination doesn't work, and when clicking the keyboard layout indicator on the panel the indication changes but the layout doesn't. I have to go to the preferences and re-assign the key combination to alt-shift, and then everything works well.
I have a very similar problem, I guess it's the same problem, but I think I better report it anyway.
I upgraded from Gutsy to Hardy the day the Hardy beta was released. When I was still on Gutsy I changed the keyboard layout switching key combination to alt-shift. After upgrading to Hardy the key combination doesn't work, and when clicking the keyboard layout indicator on the panel the indication changes but the layout doesn't. I have to go to the preferences and re-assign the key combination to alt-shift, and then everything works well.