had the same issue with no permissions access, had to change the access from public to something else and save, then make it back public to make it visible.
on the other hand, making a new page, was fine.
im not too big a fan of the new layout either, but i haven't had a chance to really dig in to try the new workflow yet, its only been out for 6 hours, although beta has been out, and i did try that a bit.
new designs / layouts for new production code, is often neccessary, especially now that it appears they have pseudo merged the backend and frontend editor. on top of that I see a new menu option to make an sp pagebuilder dashboard, I am assuming for easier front end editing for non-computer programmers.
pretty good stuff, i think. so far pretty impressed, it will just take a bit to get used to, but on the other hand, i dont mind having to break the sp page builder to a new tab window, since i often have to work on the backend of joomla along with the page editor on different tabs, this just automatically sets me up to have to do that from the start.
keep up the good work joomshaper.