DX11 RF2 start problem

[Serj]

Clicking to start the game in DX11 beta version mode, I can run only 32 bit mode sinlge player without any problem. But if I want to play multiplayer, after coonecting to server it send me back to desktop without any errors(all needed content I had). Just mystics....
In 64bit mode I cant play even in single mode player.
So what can I do to start up dx11 mode in multiplayer?

 

[Gijs van Elderen]

System specs? Windows version?

 

[Serj]

Win 8.1 x64
I5-3470
16GB RAM
R9 390X