Looks like Alex already fixed the issue of it not playing (but not blocked the ads yet as feedback is needed), but you can check for filter updates and see if it works now.
Here's what I observed. I was still getting the grey screen until I unchecked the extensions toggle. Now the video plays. I enabled adblocker, stealth, DNS, and browsing security. The video still plays but has ads. I tested again with the rules applied, the video still plays but still has ads.