[MC-18985] "S" and "T" keys stop working after accesing debug menu

After accessing the debug menu, the S and T keys stop responding. The screen lags out, the sound cuts out, and the S only yields a tiny move backward and the T eventually opens chat. **Also, I notice that it looks like it has to load every chunk every time I turn.

It takes a client reboot to reset this. And I found out this morning that it affects the 1.6 prerelease too.

This is what shows in the launcher every time either key is pressed:
(Not sure where it stops and starts, so I copied a few times)

Client> Starting up SoundSystem...
Client> Initializing LWJGL OpenAL
Client>     (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
Client> OpenAL initialized.
Client> 
Client> 2013-06-24 18:00:41 [CLIENT] [SEVERE] ########## GL ERROR ##########
Client> 2013-06-24 18:00:41 [CLIENT] [SEVERE] @ Pre render
Client> 2013-06-24 18:00:41 [CLIENT] [SEVERE] 1281: Invalid value
Client> 2013-06-24 18:05:49 [CLIENT] [INFO] Reloading ResourceManager: Default
Client> 
Client> SoundSystem shutting down...
Client>     Author: Paul Lamb, www.paulscode.com
Client> 
Client> 
Client> Starting up SoundSystem...
Client> Initializing LWJGL OpenAL
Client>     (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
Client> OpenAL initialized.
Client> 
Client> 2013-06-24 18:05:51 [CLIENT] [SEVERE] ########## GL ERROR ##########
Client> 2013-06-24 18:05:51 [CLIENT] [SEVERE] @ Pre render
Client> 2013-06-24 18:05:51 [CLIENT] [SEVERE] 1281: Invalid value
Client> 2013-06-24 18:07:29 [CLIENT] [INFO] Reloading ResourceManager: Default
Client> 
Client> SoundSystem shutting down...
Client>     Author: Paul Lamb, www.paulscode.com
Client> 
Client> 
Client> Starting up SoundSystem...
Client> Initializing LWJGL OpenAL
Client>     (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
Client> OpenAL initialized.

I tried changing the controls so that R is walking backward and Q is chat. These seem to work. I tried changing them back to default, but they still don't work. I changed them back to R & Q, and accidentally hit S by habit and the same error/response occurred.

This does not seem to be a problem on my 0.9.5 on my windows 7 pc, only the mac, though I've not intentionally tried to replicate it, it hasn't happened yet.