We solved: it is sufficient to remove the lines relative to "privacy", "automodule" and "exportFrom" from the XML file, because they misguide the TA 10 interpreter, while being not necessary for the correct interpretation of the contents. Thanks anyway!

I would advise against using the Student package in maple most of the time, it often returns more information than you want and separating it can be hard. In this case, there is a function VectorCalculus:-Gradient which appears to be identical.

You can also use 'Mathematical Formula' - 'unordered list of formulas' instead of the Maple-graded response area to accept a list of unordered numbers separated by semi-colons.

@swinkler I also see this behaviour. Can you email this to support@maplesoft.com. I might be useful to send a screencast video with the email. I am also happy to do this if you are busy.