We are using Kiwi chat as web client, there was some problems with the client on Saturday. I made some changes and it should work better now.
If anyone can recommend another client, I'm happy to try it out.
For the best IRC experience, I would recommend a standard IRC client like mIRC or Irssi. But we want to have a webchat to make it easy for people to join the chat quickly and easy.
Magma Hindenburg - Bitcoin wallet developer