Thanks so much. I did do the theme/plugin conflict tests and had no issues. The webmaster has to do the updates, but I will look for the errors on the registration page. Did you send the security information because this is related to that? Or just as advice for updating? That has to wait on the webmaster.
However, even if I am adding the information first internally and then editing through the front end (avoiding the registration page), the page not found comes up.
The weird part is the occasional functioning. Thanks again for the info.