Oh dear, oh dear ... oh dear.

Stung by the cache of loaded swfs... again.

Basically, the animation was getting hung up because it couldn't find the variables is was looking for - because instead of loading the updated swf - it was loading some outdated version that didn't have everything in it.

The way to avoid this, for testing purposes, is to attach a querystring with a random value - so that each time the swf is loaded, it is a different call, then the browser will look for the most recent file.