I've tested it with in the 008 branch and the same happens.
In both projects (in all three in fact).
And if i login from one of my websites it creates the ASPXFORMSAUTH cookie.
But SSO does not work, near forums does take the user as logged in.
And if I log on with near forums, the cookie is replaced, I'm logued out from my website and logged in in near forums.
Do you have any idea about what could be happening?
Is there some sample somewhere of SSO using SimpleMembership?