Hi, after some further investigation today I noticed that QuizMaster makes the blank question if you click “Save and Close”, but not if you just click “Save” and then go to a different screen. Perhaps that is something your team can investigate?
The plugin worked for me too. The weird thing was that my pages looked fine when I was logged in, working on the site. As soon as I logged out of the administrator, anything that had an animation applied would just disappear. My theme is OceanWP.