right shift key goes to desktop

I have an imac running OS 10.8.2 with a bluetooth keyboard. I have had it for about 8 weeks. When I hit the right shift key, all the open windows run off the screen and I am looking at the desktop. When I hit it again, the windows come back. I have taken the batteries out of the keyboard and restored the keyboard shortcut defaults. I don't have a trackpad and nothing seems stuck. Suggestions?

Solution 1:

Is this setting enabled?

Solution 2:

I went and reset keyboard defaults, I verified it said F11 for mission control. I then changed it to the problematic shift key saved it, then went back to change it to F11 and voila it worked.