Hi again.
Editing page is working, fortunatelly. I changed Chrome to Firefox. And it helped.
Thank you for your support.
Yes, it’s off.
It’s better now, because personalization is working (earlier it was broken, too). But I still cannot edit any page.
Plugin is uninstalled, php 5.6.30 is on (it’s the version I first started to worked with). But it’s still wrong unfortunatelly…