I was helping a member troubleshoot log-in problems and discovered I forgot to check and adjust the forum's cookie settings when I put the new site/forums online. I have since made what I believe are the appropriate fixes to the problem, which should prevent users from getting automatically logged out.
However, you'll have to delete the existing oldsmobility cookies that are on your computer. First, scroll down to the bottom of the page and click the 'Delete all board cookies' link. Then go into your browser's settings to ensure that all cookies attributed to oldsmobility.com are gone. Then you can go ahead and log in again...and now you should be able to remain logged in.
Sorry about the problems anyone was having. Please let me know if you have any further problems.