I've heard of the hot spots not working, but imo they're quite bleep anyway. You're much better off assigning various expose commands to the function keys, I've had it like that for years and never had any problem.
the dock issue only happened to me once, but I've heard of it happening to other people. As i only had it once, it was back to normal after a restart. Try leaving it on normally, instead of just when you put your mouse over it, although it may seem annoying at first, if it works, you'll get used to it quicker than constantly re-booting.
great apple support on everything apple:http://discussions.apple.com/index.jspa