Guys, I appreciate all the great testing and feedback!
Hopefully some of the tweaks I've done over the past few days will resolve some of the issues and as the dust settles we won't have that problem any more.
If you do experience the dreaded "logged out" issue, please reply with:
Browser version
If you left the site, cleared cache, and came back
If you are still having problems and able, another option might be to delete your cookie(s) for this site. They are the primary item used for sites to keep users logged in, and deleting it might force them to reset.
1) Updated the software to the newest build that was suppose to fix IE 11 issues.
2) Put some code into the .htaccess file in root so anytime anybody hits the site they are forced to www*
What's odd is that my other sites running this same software have not received any reports of similar problems, so I'm guessing it has to do with the redirects from the old site, old bookmarks, etc. since that's the only difference between here and my other converted forums.