Nope, I logged on about 20 minutes ago, and for some reason this happened. EDIT: If I use /ch qm (channelname) it works for some reason
You most likely have your multiplayer chat setting set to: "Commands only". This allows you to only type commands, yet see all other chat at the same time. I've experienced this problem before as well, all you need to do is simply set your multiplayer chat settings to: "Chat: Shown".