No I'm not. I just tried it in both tabs. It's working fine.
I just tried at discourse-babble.com from my Chrome & Firefox and it was working just fine too!
The reason maybe something else but this is what I was able observe from here. It was strange to have this exact behavior of Chrome and Firefox effected if I had the www sub domain or not! And its effecting only the behavior of Retort for that I thought you are the only one who could help!
You are right. It wasn't related to the sub domain type. It was happening randomly. When I logout and login with different user, it was working sometimes, other times not! I lost what could be the reason but its still happening randomly!