I tried adding TaskChain "The Equilibrium Concept" on http://bateson.kanazawa-gu.ac.jp/24/course/view.php?id=2
When I hit preview, it is blank.
Here is what I did.
I uploaded a zip file containing two HotPots and some images. After unzipping I pointed to the first HotPot as main file. Then I edited the chain with usual >= 90 for next task with a same task condition and similar for the second HotPot with end of chain.
It is called the equilibrium concept.