Hello Gordon,
This is a follow-up on the apostrophe issue.
I had left it aside all this time because I had to put up with a server working with sub-standard verion of Mysql (older version than that required).
That time is over and I can now work with up-to-date Moodle and environment.
So my context is latest Stable Moodle 2.8, latest Taskchain, and required environment.
The issue with the apostrophe is still there: the apostrophe is not recognized but is expected so there is no way of getting the right answer excep by cliking on "hint" (which removes quite a number of points, the students hate it...
The apostrophe my students use is the (only) one _I think_ present on French keyboards (the key shared with "4" on the upper line of the keyboard.
I will type one for you here: '
Depending on whether it istyped in MSWord or in a web form, it will show differently (I think Word just converts it to curly (event opens it and closes it for you).
Thank you Gordon 
PS As an aside, I wanted to attach a non-working file (attached indeed), but i stumbled upon something unexpected:
I told you I am now working on an updated Moodle, All my TC activities work fine (but for the apostrophe issue). However these activities were upload through the RESTORE process.
Now, as I am trying to upload one rhubarb at a time, to check if the issue is the same depending on the way it is uploaded), I get this error (upon trying to create a TC activity):
Identifiant de module de cours non valide
Erreur de programmation détectée. Ceci doit être corrigé par un
programmeur : The course you passed to $PAGE->set_cm does not
correspond to the $cm.
(Left the French parts there, I know you can handle that 
Cheers