Adobe Flash isn't working on some sites

[Yuri <yuri@xxxxxxxxx>]

Flash used for editing on http://opensteetmaps.com isn't working at all 
in Firefox. On many other sites it works better with varying degree of 
malfunction.
I have Flash 10 and Firefox-3.5.2.

Is this a known problem? Is this likely to be fixed? AppDB only seems to 
talk about the design studio, not the Flash plugin itself.

Yuri