Intermittent mouse listening problems - known bug?

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I am testing a new site, and although it works at least 99% of the time, I once saw an issue where the Flash movie seemed to ignore mouse movement, although clicking still worked.

Hard-reloading the site over and over didn't fix it. It only went away after I restarted Firefox completely. However a visitor to the site is unlikely to be so persistent!

I could dismiss it as a one-off except that a friend reported a similar mouse-position related issue, also on Firefox/Mac.

Here is the website: www.graham-mitchell.com

And here is a video of the misbehaviour: http://www.youtube.com/watch?v=Budpmh0PpIY&feature=channel

I'm using Firefox 3.5.5 on OSX 10.6.2.

[foto-z]

My Flash Player version is MAC 10,0,32,18