Just installed SPPB 4.0.5 and went well.

This first issue I found is then I can't get back to the administrator.

I was happy when I found out the option 'Don't show this page next time'. When you enabled that, the start page isn't showed any more. You just com on the page screen (when logedin on the front-end).

When I click back to the administrator, I will com back to this page. Due to the fact the a cookie is set "sppb_no_defalt_page" and your applicatipon is touting to "/administrator/index.php?option=com_sppagebuilder", you will see the sppabgebuilder Page overview page. The URL should be '/administrator/index.php'. Then it is working properly, even when the cookie has been set.

Small bug, but irritating.