I try to create a mini panel to test it. In the second wizard begin to show this message:

You have unsaved changes. These changes will not be made permanent until you click Save.

I finish to create the mini panel and never see a save button. I test some diferent layouts and add content or not. Finally I get a minipanels but I can see it when place it like a block.

When I try to edit the mini panel only show option to edit title and description but can edit layour or content inside minipanel.

so strange.