Adding to what Neon-Crystal had said, go into your media folder and click the folder named "Particles". Make sure you delete anything ending in _0 or _1. These copies cause your game to crash usually before you make it to the log in screen.
Ahh yes, everyone has been getting the 'Error 503' pop-up lately. Just refresh your page and it should work c: (error happens frequently when clicking links or extensions such as 'Home' or 'My Messages')