Same problem started for me this afternoon (new model iMac, OSX 10.8.3, Minecraft 1.5.1). I've been running Minecraft fine for several months, even played for a couple of hours this morning with no problem. Going into the game this afternoon, pressing any one key works fine (e.g. W to move forward) then all keys become unresponsive. Happens in Single and Multiplayer. The only other key that seems to work is holding ESC for about 2 seconds which opens the settings menus. Mouse responsiveness is fine. I updated the LWJGL files per some forum suggestions but no dice (no better, no worse). I am using a wireless bluetooth keyboard, haven't tried switching to a different input device yet. Thanks for any attention you can give this problem.
Bob Schulz
Same problem started for me this afternoon (new model iMac, OSX 10.8.3, Minecraft 1.5.1). I've been running Minecraft fine for several months, even played for a couple of hours this morning with no problem. Going into the game this afternoon, pressing any one key works fine (e.g. W to move forward) then all keys become unresponsive. Happens in Single and Multiplayer. The only other key that seems to work is holding ESC for about 2 seconds which opens the settings menus. Mouse responsiveness is fine. I updated the LWJGL files per some forum suggestions but no dice (no better, no worse). I am using a wireless bluetooth keyboard, haven't tried switching to a different input device yet. Thanks for any attention you can give this problem.