Visual Editor works only if the user is an administrator!

Hello,

I’m having an issue with the Visual Editor when I’m trying to create/edit a page: it seems something related with the role of the user because as an “administrator” there’s no problem at all but as an “editor” the textarea is apparently empty, I can’t enter any text (it seems blocked) and the options “Visual” and “HTML” are not displayed. When I change the role of the user from Editor to Administrator, the visual editor works fine.

I’ve tried with “Use Google Libraries” plugin without success. Maybe is the PHP version (I have 5.3.15) or my server doesn’t have the right settings? I also unchecked the option “Visual Editor ” in the user settings and the problem remains.

Another issue I’m having with some plugins like “Advanced Access Manager” is that after activation, my website crash and give me “error 500” until I remove the plugin via FTP.

This is a fresh installation of WordPress 3.4.1 in a new server (LAMP with Centos) and the only change I made was to the httpd.conf file by adding these lines to make the permalinks work correctly:

<Directory /var/www/html/>
AllowOverride All
</Directory>

I’ll appreciate any help about this…thanks!