ivoSF: sometimes the ratings do change, but you just don't know it.

That is it is possible your rating was 1533.0 and it raised to 1533.4 (but since you don't see the decimal part of it, it looks like it raised 0)

furbster: Fwiffo had the same problem in firefox, and I'm not sure if he has it fixed yet (using a different browser worked for him.)

Things to try:

Reload the page while holding down "shift" key - this forces the page to reload all the graphics again and hopefully the board graphics correctly.

If that does not work, try clearing the browsers cache - this also will remove all the graphics from the page making the browser to re-download the game board graphics.

To learn a little more about Go, try going through the tutorial that is listed above. (and below in the post)

http://playgo.to/interactive/

I've almost made it through the whole tutorial, and I believe I at least have a beter understanding of the game. Far from an expert, but hopefully I know enough to be able to win against other non-experts.