Sometimes (seemingly randomly) the game behaves as if a key is being held down when it isn't. E.g.: W, A, S, D, Shift, and Command on Macs (this manifests as a problem when deleting text in the chat because Command+Backspace deletes entire words at a time on Macs).
This bug affects Multiplayer as well as Singleplayer (ever since Minecraft was changed to run a local server for Singleplayer).
I thought 1.6 brought an updated LWJGL version which was supposed to fix the issue, but it hasn't.
Do you have any idea to how reproduce it? Or this will close as Cannot reproduce