Whole bunch of errors on WP website – media upload, edit slugs, edit screen not working [closed]

I am having a problem which I didn’t meet before. I took a client website for just a small bunch of modifications, so I wasn’t there when WordPress was installed or when the theme was developed.
But when I enter the admin area, I can not upload media, I can not edit slugs, and on top of all, the “edit” screen for pages and posts is not working: I can’t see the text I am typing, I can’t see the format buttons, I can’t use the visual/html buttons (please see attached). The website in question uses Genesis framework along with a Genesis theme child. It has a bunch of plugins installed. Now I am asking you, in your experience, what could cause these problems?

– WordPress was installed wrong
– A plugin is causing the problems
– It has something to do with Genesis
– …?

problem screenshot

What do you think?

I had the same problem, but some extra and different plugins, after 2 days of disabling plugins one by one, checking theme files etc, etc, I decide to start from 0, Backup database, (all post, etc,~) and just re install. Not a beauty, but it will solve the problem faster than you searching for the needle on the haystack.

Possible quick solution –
Reinstall all including Plugins.