This is my current IP address 175.136.214.41 , can you update your site FTP access as well?

And provide us that video page URL which showing this error so we can better have a check.

Thanks for the quick reply, but as usual I've found the issue and have found the solution.
Should any one else encounter similar, here's how I resolved it.

In the apps options, I selected all categories in the permissions box, (see screenshot), as soon as I enabled these, all videos displayed correctly on the site front end.

Hm, that is strange, by right if you didn't select anyone of that categories, it should allow all the permission.

By the way, thanks for sharing and keep us update if the issue still persists in the future.

It's going to cause a problem the very next occasion when a user creates a new group.
I find if I remove the highlight from all categories, the 500 error reappears!
Definitely a bug in the most recent update. Hopefully addressed in the next bug-fix release.

That is not known issue for the current release, perhaps you can whitelist my current IP address 175.136.214.41 and provide us with your FTP details so we can better have a check?

Sorry not now as I'm about to retire, it's 05am here in the UK. I'll look into it again tomorrow.

No problem Anthony, keep us update if you need any help to identify this issue.