FreiChat suddenly disappeared? ver 2.3

Hi there, 
I installed the FreiChat plugin for elgg 2.3 and it went very smoothly. The chat window popped up and the icon was there. It's been working for a few days, but then today it's suddenly not there. I've moved FreiChat to the top and the bottom to see if it was related to where it was in the plugin list. I also uninstalled and reinstalled the plugin. I've de-activated several other plugins I've added to see if there's a conflict, but there doesn't seem to be any effect. 

I'm just learning about Elgg and I'm looking for some trouble shooting tips.