SOAP UI 4.5.1 and maintaining an HTTP session.

Has anyone experienced an issue with session maintenance with SOAP UI 4.5.1.? I have "Maintain HTTP Session" Checked off, and still cant get a second message through after the session is created. If I paste the cookie into the header on message two it succeeds. Is this a known issue with 4.5.1? Thanks in advance for any information regarding this. GG