New vBulletin version installed - info here on new features, etc.

[TFucili]

In the past, I have been able to stay logged in. Now, I frequently have to relog when coming back to the site.

 

[Steve St.Laurent]

Nothing changed on the login procedure. Go to this thread - https://www.turbodieselregister.com...nly/108976-having-trouble-staying-logged.html - and try the things there and see if that fixes your problem.