After I upgraded to latest 6.0.1 I'm not able to create and edit pages anymore if https is enable. The loading symbol does not disapear and after some time I see the message:
Loading the editor's taking longer than usual. Give it a few moments, then refresh your page if it still doesn't load.
Is https turned off, collaborative editing works correctly.
Https with switched off collaborative editing works
Https ports in the firewall are switched on.
Cheers
Reinhard