Upfront no loading

Hi,
I see different topics about the same issue, upfront is not loading correctly, no popup, or not loading at all.
It's a multisite network with domain mapping, exemple on this mapped site : http://chickenyls.com
The background images appears blank and it's not possible to edit any images, it was working earlier when the site was getting built.
I believe it is a host issue at page.ly, if you could point me it the right direction ?
Access is granted if you need.
Thanks a lot,
Thibaud