Multiplayer 1.5 Playerlist

Gamemode affects all - on some servers (not all but alot (Vanilla servers & Bukkit servers) for 1.5 have been having a issue across the whole server where when you press TAB or whatever button assigned to playerlist the playerlist appears but its moved so high you only see a tiny strip (which is below lowest name) of the GUI
-THAT IS ALL THE INFOMATION CURRENTLY AVALAIBLE