Hi there,
We have just installed this plugin YITH WooCommerce Multi Vendor / Marketplace (yithemes.com), but it has caused an issue with X Theme Pro. Once activated the theme editor stops working correctly and cannot add elements to a page, and the theme is unable to even edit images.
I have attached screenshots showing what the theme is doing while the Vendor plugin is active. You will see in one screenshot, the theme gives us this error message, in the other, elements to add (such as text, buttons etc) are gone. Deactivating the plugin fixes this but we want to find a way to resolve what seems to be some kind of conflict.
Any help would be greatly appreciated, we are also contacting the plugin developer and reporting this issue with them.