WPMU Chat plugin widget isn't being displayed


I’ve installed and tested this plugin a couple of months ago and it was working perfectly. Now, for some obscure reason, the widget that used to be displayed at the bottom right corner when an user logs in isn’t being shown anymore. What I want, and that I had before, is to have a friends and group chat, pretty much like what we see on facebook.

Support access is active if you need it and my wordpress and FTP login credentials were sent to you guys with Vaughan’s name at the subject line like 3 weeks ago.