On the site navigator, I can click on the page and open it using "Edit" but once the page is displayed, I can't edit anything.
I can't click on any component to edit them.
The "Edit" option on the top right hand core is greyed out. If I click on it, it goes Blue for a few seconds, then reverts to greyed out.
The Preview button also doesn't work and the "Design" and "Develop" options are missing entirely.
If I look at localhost:5402/useradmin, then the Admin user has all the permissions for the /content/<site> clicked.
I can't see anything relevant in the logs.
Check the console logs.
Refer this thread a s well-