Thanks for your reply and suggestion. Unfortunately, the issue is back, which makes play-a-long-videos pretty much impossible.

Fortunately it seems this issue is only happening with videos embeded in the lesson. [br]When I select "Download lesson" (it's not actually downloading unless you right-click and save it), the video opens as a stand-a-lone in a new Tab and it loads super fast and without issues.

It's not ideal, but it works. I still wonder why it has issues loading the video within the lesson itself. And why no one else seems to have this issue.