Steam ticket issue

[Dr Boners]

I get this error whenever I try to play Eternal Silence.
Any idea what causes it?
"Disconnect: Error verifying STEAM UserID Ticket."

-e-
It does it for all my games now :(

[Enforcer]

delete clientregistry.blob

[Enforcer]

FIXED? I WULD LIKE TO KNOW PLZ. thx