[clivehawkins]

A problem indeed.
Someone once advised me to give the problem student a clearly defined assistant role during activities, eg in a vocab game she is the one who checks the others are following the rules, helps judge over any disputes etc. Giving them more responsibility often gets them over to your side.

I've tried it a couple of times and it really does seem to work. Give it a go before trying to change the type of activities in class. It seems a pity that the others can't do the things they enjoy because one element ruins it. Good luck!