I hope you are fine!
First of all it is not about the Default Theme but Upfront wasn't found in the drop down lit of Themes and plugins!
Do you know any tutorials, guides, examples to convert a Visual Designer Theme to Upfront.
The Visual Baker stuff is globy and slow and not at all useful as the upfront real wysiwyg editor. So we think about changing some of our Themes to work with Upfront instead.
Looking forward for some advices