Hello there,
I'm having problems with scoring, too. Old exercises work normally in Moodle 1.6.4+, but when I regenerate them with Hot Potatoes 6.2.8 they no longer do so and new exercises don't either.
I've attempted to connect to your site, Gordon, http://bateson.kanazawa-gu.ac.jp/moodle/16/ms/login/index.php but I've forgotten the password and though I've it says an email has been sent with a new password I haven't received it after several hours.
I can't show you old/new examples on my site as it's part of what's not open to the students yet.
I can show you the problem with a new exercise here: The Battle against Colds and 'Flu: a Self-Treatment Guide: A The exercise works perfectly as I intend (I've made several modifications to the source code) but the scores are not saved. It's based on the html file.
On the other hand, in this version based on the .jqz file, the scores are recorded but it doesn't work as I intended (lines are visible, there is a pop-up feedback box, etc.): The Battle against Colds and 'Flu: a Self-Treatment Guide: B
The code validates.
The enrollment key is: M1QV34
Cheers,
Glenys