Hi Martin,
This is the right forum: just put TaskChain in the subject of your message.
The other thing you can do that is helpful for Gordon is to upload a copy of the problem exercise to one of his testing sites. 2.4 is preferable because some things that were problematic in 2.3 have been ironed out in 2.4. But if you're stuck with 2.3, this is the site for you:
http://bateson.kanazawa-gu.ac.jp/23/
Username: guestteacher
Password: taskchainv09
Cheers,
Glenys