Tom: Another issue I now notice is that I'm logged in the forums/on the website, but not in the arcade.
As usual, my browser of choice is FireFox and apparently, 12 days ago it was working, but today I tried to answer a comment posted on one of my games and the button login does take me to the main scirra.com page (where I'm logged in), but when going back to the arcade from there, I'm still considered/displayed as not logged in.
Strange.