Yes I've read all the other threads yes I've tried all the solutions (restarting, clearing cache, uploading new admin and includes, changing the language file to en.js and of course switching off plugins) and no, none of the above worked even with a fresh hosting account new install with all the above completed.
I have the same issue on sites that are upgraded to 3.3.1 or sites that are fresh installs of 3.3.1 so I doubt it is an upgrading issue.
What is even more intriguing though is that this is only happening on my iMac in Safari, Firefox and Chrome, Opera gets a little closer and displays all the visual editor buttons and the text content to be added as white on white. Now if I visit the same sites on my MacBook Pro everything is working, switch to the server and again they are working, ie8 on a windows 7 computer is also displaying the visual editor and I can even get it in Opera on my Android Phone.
So I have come to the conclusion that it has something during installation that effects the computer the installation is being carried out on. It doesn't just effect the web browser it as it effects all the others on that machine.
Thankfully I can work round this and have a vague confidence that the client will get to see the admin as it should be with a visual editor.
But my question is what can I do to clear this, to make the visual editor display correctly on the machine where the site was initially installed, if I only had one computer I would be in real trouble right now.