Auto-Walk, Jump or being stuck in place.

This is a bug that has re-appeared so please do not close. This happens in both single and multiplayer. I did a search for exisiting, but they are resolves due to the bug existing in older Minecraft versions but has since re-appeared in 1.6. The character will randomly start walking, jumping or come to a complete hault. Sometimes the character will even walk backwards or sideways. If I pull up the esc menu it stops, but will continue to auto-walk and/or jump when I get it to move again. It was if it is not responding when it doesn't move, or as if I am holding my WASD keys down to continuously move. My keyboard is not the issue; no keys stuck at all while typing this report. I have never experienced this glitch until the 1.6 update and no matter how many times I have closed and re-downloaded and cleared out all minecraft files, the problem persists. Please help