What do I need to do to replicate it? I installed both of them on WP 4.1 and I didn’t see anything weird.
If you open the /frontend/class-frontend.php and look for line 41.
Then change this code
require_once( $template_list[ absint( $this->settings['template_id'] ) ]['path'] )
into this code.
include( $template_list[ absint( $this->settings['template_id'] ) ]['path'] )
I have no idea why this sometimes happens, and why this fixes it for some people. It is a combination of some themes / seo plugin that triggers it.
Let me know if this fixes it for you as well.
Thanks Tijmen, has solved the problem.
We also thank you for the great plugin that you have developed .
Luis Viadel