Joined private IRC server as "subwaybone", and joined our work server. Coworker then proceeded to kick the user; in the IRC channel, I saw the user rejoin, but the web interface showed an additional channel tab, but without any content.
Screenshots: http://i.imgur.com/nGxV6.png http://i.imgur.com/3CXDJ.png
Quick update - I can still type things into the web client, and the text shows up in the channel, but I can't actually see anything said in the channel.
Also, if another coworker uses subway, the kicked user is not removed from his user list.