flashplugin-11.2r202.238 fails to display openstreetmap.org editor

[Yuri]

To reproduce go to openstreetmap.org to some locale, login and hit Edit 
(top left corner).
This opens Potlatch 2 editor, it shows some panel on the left and on the 
top, but not the map itself. Map area stays blue.
Potlatch 1 editor (available through the down arrow near the Edit 
button) works fine.

Potlatch 2 works fine in Ubuntu with the same flash version.

Yuri