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YouTube is now fully blocking ad blockers around the world
(9to5google.com)
This is a most excellent place for technology news and articles.
For quicker syncing, you can:
Open uBlock Settings -> click Filter Lists tab -> type "quick" into search box -> click clock icon for "uBlock filters – Quick fixes" -> click "Update Now" button up top
That will only clear the cache for the fixes that actually counter the youtube countermeasures. Helpful if it takes a long time to download and refresh when all of the caches are invalidated.