I can't get the OptimizePress plugin's "LiveEditor" feature working, what can I do?

Unfortunately, the OptimizePress landing page plugin's "LiveEditor" feature will not work out-of-the-box with your Theme Blvd theme. However, with some minor code customization, you can get things working. Because this will be a code customization, you will need to be using a  child theme, in order to implement our suggested fixes.

Here's a complete article from your  developer docs that outlines the issue and provides fixes for different themes:

Developer Docs: OptimizePress Compatibility