am I banned or something?
Nope -- if you're banned, you can't login and you can't get a reply box to open.
But our history doesn't show that you've posted anything to General Topics since September of last year, so it's possible that something's going wrong when you're trying to post.
Were they replies or new threads? Did you wait until the message showed up as posted or did you close the page right after you hit 'post my reply'?