I use xbindkeys under kde4 (start xbindkeys with kde's autorun), add some hotkeys: win+a, win+c, win+h, win+j, ... When kde4.4, All are OK. Few days ago I upgraded to kde4.5 , So something is wrong: When I just enter desktop, some keys( win+h, win+j) would be invalid, but when I restart xbindkeys, All keys will be OK again!