At the moment I can get subtitles in the original language, but if I click on autotranslate to any other language nothing appears. Some videos have an alternate language audio track created by AI and that still works, although I prefer the subtitles. It turns out this is nothing to do with any software update or adblocker, but is a problem with You Tube itself which many people have experienced:
https://www.reddit.com/r/youtube/comments/1n0kvr6/anyone_else_having_trouble_with_auto_translated/
Knowing this might save a bit of time looking to see where they have gone. ;)