I installed this plugin on my site without a problem. I then opened up an IE browser and a Chrome Browser.
I was able to open the bottom right corner chat and an in page chat with out a problem in both browsers.
When I typed something in one browser it would show up in the box on that browser but it would not display in the other browser. If I refreshed the page in the other browser it would then show up.
This occurred in both the bottom corner and the in page chats.
So, in order to chat I would have to keep refreshing my screen to see if someone had replied. Is there some setting I am missing here or is there perhaps a port that should be opened on the firewall to enable chat?