Problem with javascript-static.js

Hi I'm a moodle newbie.

I have just finished installing moodle 2.3.6+ on lamp.

While cheking the site as admin I noticed the UI is broken.

after a consult at #moodle on IRC I noticed that the issue is due to 

/moodle/lib/javascript.php/1366301765/lib/javascript-static.js which was not found.

I checked the moodle installation and the file is available at 

/moodle/lib/javascript-static.js

any idea how to fix this?