I looked at the admin files in the test gallery - is it the pp-inc.php file that is messing me up again? I see that's it's required in admin-inc.php, which is required in admin-index.php. But this is the same in v 4.86 right? And my admin works perfectly fine there.
I deleted all the files that are no longer used by the newest version and uploaded the files from v 5.3 again. And I've checked the permissions, but it still only comes up with a white page on admin-index.php (but with the grey bar that separates the menu from the page). Also, the header and footer I uploaded (that are the same as the ones in my regular gallery) aren't being displayed, if that can have something to do with it. Still no error message, either. That's where I'm at
