New to using this module. I had the a chat open in oen window and I was the only one in the chat. When I when to the main page of the site where I have a who is chatting block.

It showed the the chat as empty. I refresh of the page then showed me in the chat.

I traced the problem back to Drupal code in the block array. It calls getOnlineNick(NULL). However that function takes a second parm of a timeout vaule and it defaults to 20 seconds.

So if your timeout is higher than 20, which by default it is 35 seconds, and the client side is pinging the server only every 30 seconds, you will not be listed as in the chat.