Well, the good news, Adobe’s recent 9.0.124 release fixes this issue for most browsers.
Safari 2, Safari 3, and Opera were all fine on Mac.
IE6, Firefox, Safari 3 were all fine on Windows XP.
The issue does remain for Firefox on OS X & Linux (Unix code versions). Hopefully they’ll fix it in 9.0.25, but it’s nice to know it’s being worked on.
Note – in Firefox on Mac, the first click worked for me, the second click would be blocked. And eventually all clicks were blocked.