WiFi connection problem in firmware v4.1

Hello Guys,
I try to connect to WiFi network from my program in EMM firmware v 4.1 with no success.
However the same code establishes a connection in an older firmware version. Therefore I think that the problem is in a latest firmware release. Any suggestions? Thank you in advance.

See this please http://www.tinyclr.com/forum/10/3213/

Thanks a lot for the quick response.
Kind regards