For a little while now, I've been having great difficulty in walking. I've seen various posts on this topic, but none seem to address the problem I'm having. Here's what happens:
To start with, I can move around in the game quite normally. After a little while (sometimes just a minute or two, sometimes longer), it becomes increasingly hard to stop walking. I'll be moving to (say) the left, and when I release the left arrow key, I will continue walking for a little while, overshooting (sometimes by quite a way) the point at which I was trying to stop. If I try to jump, there is a similar delay before the jump happens. It's as though those key presses are being buffered for a little while before being handled. Jumping on to a platform is virtually impossible.
This is rather frustrating, and the last few times I've played, I've just ended up giving up and quitting the game. As it is, it's pretty much unplayable.