Bugs in content types

We recently upgraded our Moodle installation to version 3.5

Post upgrade we are unable to create H5P content, nor load any previous content.

We see only Loading, please wait with animated circle icon when we try to create new content.

For interactive Video, the brouser console shows following error:

VM2462:4683 Uncaught TypeError: Cannot set property 'Explainer' of undefined

    at eval (eval at ns.libraryRequested (h5peditor.js?ver=2018053100:78), <anonymous>:4683:24)

    at eval (<anonymous>)

Hi,

Small issue with flashcards as I let site users create their own content. It says the answer is optional, but it's not, as the box still shows.

Thanks.

Running Course Presentation using Drupal 7 on both Chrome and Safari on both Mac and iPhone, just uploaded H5P a few days ago.  When I insert an interactive video and leave Auto-play unchecked, it behaves as it is supposed to.  If I select Auto-play, it begins playing (I hear the audio, at least) sometimes when I open the presentation and, if not then, everytime I select the slide before the slide containing the video. If I insert the video using the non-interactive menu item, it will Auto-play correctly. Any ideas?

Thanks