Thanks very much muncken. Your tip on changing the sitreurl in the wp_options table worked for me!
I have my wordpress installed in a sub directory called “site” but the site url was set to mywebsite.com:/site. All I did was remove the “:” so it is now mywebsite.com/site
Now I can see and use the visual editor again : )
For info, my server is linux on 123reg. Hope this helps someone else.