Today was the first time I received this error trying to login in the front end:
Session expired or cookies are not enabled in your browser. Please press "reload page" in your browser, and enable cookies in your browser. Please refresh/reload page before filling-in.
I had to disable Community builder and had no problem logging in.
OK, I discovered how to fix this, at least for me. I deleted my user account in Joomla and created another user with the same permissions and it worked. Why this occured I have no idea but I had to do so with all four of the registered users to get it to work again.
Thank you for your response. Forums are wonderful!!!