Created new Field Groups, but they weren't displaying on the Post Edit page. Dev Mode messages didn't indicate anything different from normal.
Set up staging site - issue was resolved with WPCode Lite deactivated. Not sure if the problem is your or theirs or both, but since I was working with MetaBox, reporting it here.
I have the latest version of MB installed along with Builder & Conditional Logic.
Below is info for the version of WPCode Lite.
WPCode Lite
Easily add code snippets in WordPress. Insert scripts to the header and footer, add PHP code snippets with conditional logic, insert ads pixel, custom content, and more.
Version 2.1.12 | By WPCode | View details
I have a staging site set up that you're free to use if it helps.
Also - once the field group is created, I can reactivate WPCL and the new MB field Group works fine.
Version 2.1.12 | By WPCode | View details