I've never experienced this before, but now for some reason my screen is starting to jump around. I think it has something to do with the ads. When a new ad loads, my screen jumps. So I'll be reading or typing and suddenly the screen is on a different part of the page. I honestly don't know how long it's been going on - but it's a relatively new development and happens all the time now.
It hasn't happened while I'm writing this post - but this is the longest I've been on a page without it happening. Which is also why I'm thinking it has something to do with the ads. Because the new post page doesn't have any ads on it.
Maybe I'll just have to spend all of my time on CB now writing new posts instead of reading any or commenting on other threads. Then the screen jumping won't drive me crazy.