Actually I think some of the problems I have had have been due to another problem which I will try and track down as I think it might be a bug somewhere else. (Briefly if I use adblock.css directly it works fine but if I use another CSS with @import url('adblock.css') it works most of the time but sometimes a page won't display at all.)
Meanwhile though, one site that continuously has problems for me is:
http://www.whitepages.com.au
Do a search for (example) :
business name: jb hifi
state: Victoria
The results page is completely screwed for me (no CSS). Does it work for you?