I'm having something of the same issue, JD. For a few weeks now.
Sometimes the typing gets intermittent in that it takes a few seconds before what I'm typing/clicking actually appears, but more often it just sits there and does absolutely nothing.
I've found if I click in another tab and then click back, whatever I've typed appears. Since I'm aware of this, I'll start typing a sentence or two and nothing appears, but then I click out and back in again and poof, it's all there as if everything's normal.
That doesn't always work though. I'll start typing and after a few seconds the page will jump halfway down. I have to scroll back up and click in the message box, which does not always work and sometimes takes multiple tries.
It's driving me nuts. I had to switch over to Firefox where I don't see any problems typing for the moment.