Hi Ronald,
Thanks for reaching out and thank you for using BoldGrid Post and Page Builder for WordPress!
I suspect with your change in theme the editor styles have began to clash in your page builder. Because GeneratePress is not a native BoldGrid theme it is likely they use many of the same global calls causing the display of your page editor to be skewed. GeneratePress uses there own page builder plugin called Generate Blocks and since we do not have a relationship with them they don’t keep up with the updates required for Post and Page Builder to function properly on their theme.
If you would like to continue using Post and Page Builder with a theme that guarantee’s 100% functionality you might want to consider switching to Crio Pro our flagship WordPress theme. Crio comes out of the box with over 400 premium features and being that you’re a InMotion Hosting customer you get Crio and our suite of premium Boldgrid plugins free with your hosting plan.
I hope this helps. Please reach back out to us if you have any other questions.