I Can not play in browser game second time on my browser! C# WPF/WinForm

I have problem with my browser. I play in browser game "DarkOrbit". I wrote my browser to this game. It is normal browser without advanced functions. And look at this now. I can log in on my game. I can click start and after it i can plaing in this game. It is COOL but when will i do log out and i EVEN close my app and again turn it on this game not working. I still can log in but after clicking start instead loading screen i can see balck screen and nothing more. I know this problem is totaly strange but i dont know what is going on.