WPMUDEV Chat not working!

Hi WPMUDEV Team

We installed the Chat module but it seems not to be working,

A grey bar shows up on the bottom right but no text gets displayed nor is it clickable or opening a chat window.

When logged out it is possible to open the chat window and it says that you have to be logged in to partcipate in the chat but after you logged in you can't open it!

Thanks Andi