I know the answer to that question! By any chance are you using an "intelli" mouse (USB), or some other 3rd party USB mouse? If so, there is a piece of software called USB Overdrive. It fixed the problem i had with many of my programs. It also fixes the problem of using your mouse before the extenions load. I don't know where you can find it, but just search for it in download.com or somthing.
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Hope this helps!
-Bizzare