Xibo Ubuntu Client not running properly without sudo

Hello,

I have a strange issue.

first the infrastructure details
Server : Ubuntu 12.04, VMWare Virtual Machine
Client : Ubuntu 10.04, Zotac Zbox ID41

A few days ago, I installed both server and client and everything was working fine.
Then I move into the final configuration where both server and client are isolated from my Office network in a separate VLAn.
Once again it still worked.
Then I moved the client from a wired connection to a wireless connection -> still working.
Finally I decided to review my default template which was made of ticker and webpages, which could not be accessed anymore as the VLAN can't access the Internet. Deleted all regions and created only one with sliding text..
From there, running ./run.sh launches the client as expected but connection to the server is not possible. Xibo client window gets very slow, notification dot stay orange. The client doesn't show it's IP address or disk space. Hitting Q takes forever to close Xibo, if it does close it.
On the other hand if I run with sudo : it works well and extremely fast.
I already applied chown -R user /opt/xibo.

I don't know where to look further, this is why I am requesting some help.
Thanks to anyone who can give me some clues.

regards,
Julien