Well I understand that you cannot help but I still would like to mention that in my %USERPROFILE%\AppData\Roaming\Playfirst I have a whole bunch of games developed by Playfirst all of which I bought, some of them I got from PlayFirst before they merged with BigFish, some of them I bought from BigFish. They also were developed on Playground SDK (I checked credits and website). That would be Dream Chronicles 3, Dream Chronicles 4, Wedding Dash 3, Wedding Dash 4, Fashion Dash, Fifth Gate, The Palace Builder, Chocolatier 3, and Emerald City Confidential. Out of all these PF games ECC is the only game that doesn't work.
But anyway, I guess the support will also tell me they have no idea or suggest I reinstall the game 100 times, since I am probably the only Cyrillic user client on their site.