Theme Fixer is always loading when we want customize it

Hi,
Upfront and fixer are installed.
On localhost there is no issue.
Online the main part (capture.png) isn't displayed and when we go to the dashboard appareance customize (capture1.png) it's always loading.

It is hosted on openshift.
Is there a parameter to set ?
Can you advice a host ?
https://teacher-voltairemakeit88.rhcloud.com

Best regards,
Olivier