I have been looking into this issue for about 3 hours straight now and I am stumped. I had a custom theme working for months now. Just as I am about to pass it over to my friend I double check the site and notice all the pages are not showing properly. When I click on the pages they all have the proper theme selected in the CMS but they are ALL displaying the index.php page instead of their selected theme.
When you click links, how it works, etc...those are all suppose to be different pages with different themes. It is weird because it was working before and I don't recall making any changes that would have upset the system.
Also I am using the ACF plugin. I doubt this is an issue because the Custom Fields are indeed showing in the CMS but like I said, on the front end it is clearly pulling the index.php page. Any help will be greatly appreciated.
Thanks in Advance!