On one of the message boards I frequent I tried posting a topic, but while I was writing my message, I switched over to another window and when I returned, I could no longer input text until I refreshed the page (and lost all that I had typed). This is the only "bug" I've come across so far, but I'll be sure to post if I find more.

Just click on another textbox and go back. This worked for me

it's still a bug, even if there's a workaround ;-)