My Logitech Bluetooth keyboard stops responding after using some specific panes in system preferences (keyboard, mouse, Bluetooth). Also trying to pair my apple Bluetooth mouse causes the same issue. I initially thought that this issue was due in part because of my upgrade from SL to Lion but after doing a clean install of Lion in a new HDD, I am still seeing the same issue. Why Logitech Bluetooth keyboard stops responding after using system preferences? I would really appreciate your useful information regarding this. Thanks.