> So we only have to update the Hot Module and
> the score-thing will be resolved?
Yes, that's exactly right.
Since you are using HotPot v2.1, you should download the "latest" version of the HotPot module from the downloads page:
People who are using HotPot v2.0 (i.e. Moodle 1.5 users who have not specifically installed HotPot v2.1), do not need to update because this issue does not affect HotPot v2.0.
Hartelijke groeten van Gordon