Welcome back!
You logged in, just when I issued a command to send emails to all users. That blocked your further login from working. I immediately fixed it.
The new graphics features do need some hardware. If you’re experiencing low FPS, you can disable lighting and clouds in the options menu. That way the game, of course, doesn’t look as good, but you should be able to play smoothly even on older hardware. That having been said, ATI/AMD-adapters are always a problem. 😉