Upcoming flash player update? Uh oh...
Well, I'm all for continually updating and improving products, but in the case of Flash it's a real problem when it interferes with backwards-compatability and certain methods of working. I am of course, referrring to the issues that were encountered with sIFR Flash links, caused by the Flash Player version 9.0.115 (kudos to Mark Wubben for explaining this to me) and also in more general terms to the introduction of a rigid security model with Flash Player 8.
Thanks to UnitZeroOne for their article which tipped me off.