I haven't seen this. So your saying that your cursor is sticking, even when you're not using a browser? For example, it just sticks when using something like Mail with Safari closed?
I always have Mail and Chrome open in the background so that may have been affecting the whole system. It is only affecting my browser now (especially bad in flash-based games). It's possible it's not a Flash issue, but perhaps a strange intermittent lag problem in my internet connection.
However, before I go yelling at my ISP (who is not generallty prone to laggy service like this) I would like to try uninstalling the upgrade to see if things go back to normal. Can you tell me how to do this?
Never mind... this question can be deleted. I uninstalled Flash and the problem still existed (got worse, in fact); turned off all browsers, disconnected from the internet, and the problem continued. Turns out my mouse cable is frayed almost through - time to go wirelss I guess!