Fatal error: Class 'MatchingQuestion' not found in /srv/www/htdocs/mathbaby/sites/all/modules/quiz/question_types/quiz_question/

There is a problem with autoload module, which can be solved by adding cache_clear_all('autoload:', 'cache'); to hook_install for question types with new API.

This problem is caused by autoload registry caching. Can be reproduced this way: enable all question types, then disable Matching, then clear cache, then try to create True/False question, then enable Matching, and try to create Matching question.