Visual editor disappear and all text color from all post is white

Hello there
I am new to WordPress, but I hove some experience with Joomla.
Apparently without reason the visual editor is gone for good.I mean the button is still there, but that is.
I did already most of the things that i find about this issues but with no result.
I added define(‘SCRIPT_DEBUG’, true);
I added define(‘CONCATENATE_SCRIPTS’, false);
I deactivate all plugins
I install and activate – use-google-libraries plugin
I manually reinstall WordPress except for wp_content
After I add define(‘CONCATENATE_SCRIPTS’, false); was working once but when I save the post disappear again and since then never come back.
Also i clean browser…logout from admin…everything
What else I can do….I get really frustrate about it. Being a Joomla developer I was thinking that the Joomla has problems, but I see now that WordPress is much worst.
I find WordPress too sensitive to modifications,dashboard not intuitive, at all, and if something bad happened is not much you can do.

Thank you
I just hope that this version 3.5.1 is buggy and I have a bad start with WordPress.