Not long after I provided the update above, where it seemed to be working, it stopped working. In response to your earlier question - If the Kaspersky extension is disabled (image 2), the browser exited & restarted, Kaspersky extension re-enabled, does “Ad block on YouTube appears to repeatedly not work” issue persist? Yes, it still persists. The only way I have found to get it working again is to restart my computer. David