So I think I have fixed this problem thanks to the help of one of my staff members.
The login issue looks like it has something to do with the URL you are typing to access the site. I noticed last night that this issue occurs only when I access my site using
www.domain.com. but when I click on a link it switches to
domain.com and it shows me logged in.
When I installed Joomla, the url defaulted to
domain.com I never had a login problem when I accessed my site with
domain.com
Since most of my members are used to typing
www.domain.com to get to my site. I just went into my configuration.php file and changed the livesite property from
domain.com to
www.domain.com. The issue no longer exists on my site
Let me know if that works for you.