I tried using the built-in IRC client in Impulse, but whenever I typed something, it was always trying to interpret it as a command. So, I installed Pidgin instead. Was I just doing something wrong?
I think some software just got colicky for a bit this afternoon. From late morning to early afternoon Eastern time, things worked fine for me in the Impulse client. I dropped out for a while, came back somewhere past 1500 and found no left-side user list and that everything-is-a-command thing you describe. Some time (and an Impulse restart) later, it was back to 'normal.'