We recently upgraded to Moodle 3.4 and changed themes to Boost.
As a result, I am encountering a number of problems with my HotPot activities, all of which worked previously without difficulty in 3.3 (the theme was not Boost).
Activities using the Virtual pagination V2 source will display correctly in Moodle as HTML files, but not as HotPot activities: the text in the text box displays correctly, but not the questions on the right: they are missing.
Display Boost 3.4: Quiz missing
Are you able to reproduce this problem, I wonder?
In addition, I notice that the Page background colour of none of my activities is as specified in the HotPot file: in fact, it is the same as the Moodle page itself. Similarly, formatting in the title of the HotPot activity no longer displays.
HotPot is up-to-date on our Moodle site. I am having problems with other types of exercise, too. (Jcloze, Jmatch Sort drag-drop etc.)