The same restriction is put on us for auto-complete.
However, I'm not familiar with having to log in a second time across the forum and the regular site. This doesn't happen for me. So if I'm on the forum and I click the logo at upper left to go to the webassist.com home page, then I click "Your Account", I never log in again. What are the steps you take and at what point does it have you log in again?