Add Dashlets not working

Hi, I have a SuiteCRM 7.7.8 running in PHP 5.4.33.

My problem it’s that i can’t add dashlets in homepage.
I have no error in the console and i’ve done all the repairs include JS Group Files.

My apache its with the permission 775 in all folders.

What can I do?

Could you please provide more information on how exactly you cant add dashlets?