Bugs in content types

I'm working with Question Sets consisting mostly of multiple-choice questions, and it appears that neither the individual (per question) nor the global (per question set) settings for Enable "Retry" button or Enable "Show Solution" button have any effect.

No matter what is selected with these settings, no "Retry" or "Show Solution" button is shown for individual questions, and both "Retry" and "Show Solution" are shown at the end of the Question Set. 

An unwanted Vertical Scrollbar appears in IE, in the div     "h5p-video-wrapper h5p-video h5p-youtube" 

This only happens when i use linked Youtube videos, not other video content.

Anybody else with this issue?

When using Safari, the user is unable to scroll to see all of the options of a multiple-choice question or the navigation buttons in a Question Set. It works fine in Chrome and Firefox. You can see a live example of this here (go to the second question; it may be this only occurs for questions with images?): https://foxylearning.com/tutorials/rft/10/217960-1009