webkit.net error "Cookies not enabled in browser"

Question

Hi I am developing an application using Webkit.net . It was working fine until yesterday facebook and gmail are facing problem with cookies. I can login to gmail but i cann't signin facebook, also tried to login with WebKitBrowserTest.exe provied by webkit.net binaries. See the screenshots of gmail and facebook below.


and after login in gmail when i click any email this error occurs in top of window

How do i enabled cookies. when i visit whatismybrowser its saying cookies are enabled.