Hello,
I currently run this theme, https://www.joomlaplates.com/joomla-templates/joomla-template-scene. For a while now I have been trying to customize it through the template section of Joomla. So if you go to templates>styles>jp-scene at the top there is a button called customizer. You click on it, and it shows the message the current theme is not customizable.

Now if you go to the menu system and click on the menu home (en-us) and change the menu item type to articles to single articles then pick the only article I have there.

Now go back to themes templates>styles>jp-scene, and click on the customizer you will see it does not give an error message anymore.

I am unsure why easyblog is causing this. It used to work with easyblog, but now it does not. I had some work recently done in fixing easyblog so unsure where the change might have been and why it is breaking the customizer.