Ad blocker users say that they are seeing a black screen when trying to play a video on YouTube. Here's what happened.
Mashable reports that users ran into a black screen on YouTube, and that it stayed for about 6 seconds before the video began playing. The reports indicate it affected several browsers including Firefox, Edge, Vivaldi.
Some users joked that they would rather see a black screen than an ad. While that's certainly a better experience, it does waste precious seconds of our time. A simple workaround for the black screen on YouTube is to just refresh the page, hit F5 as soon as the page starts loading. uBlock Origin's filters were updated with a patch to resolve the problem, the add-on updates its filters automatically. If you are still experiencing the black screen issue, just open the extension's dashboard and manually update the filters. This tug-of-war is getting annoying, but it appears to me that Google's efforts are actively promoting the use of ad blockers, instead of attracting new subscribers.
I've been seeing more and more State Farm ads sneaking past Ublock Origin in Firefox since about a month ago. Like OP, I also found that refreshing the page solves the problem. As long as F5 continues to fix the issue, I can put up with seeing 1 second of an ad or a black screen.
There really was some ads that get through last month, but UBO fixed that last week. Either you got lucky or you are not in that set - Google do A/B updates before.