Are you sure you have the correct filter lists? I assure you I am using Adblock as downloaded from Apple's extension page with no other extensions installed. I don't see any blank pages and I definitely do not get a single ad on Youtube.com. Using Easylist and a custom one to remove those moronic EU cookie popups
'Adblock Plus' was the culprit for blank pages
'Adblock' is the culprit of not blocking youtube ads