Yeah, sometimes refreshing the pages does 'fix' it, but if you navigate away it'll randomly fail again. Opera *should* be blocking that whole advertisement field too. When you know unexplained-mysteries has failed is, when there's black ad placeholders in the column on the right side of the site. I thought it might be my filter rules and I've tried redoing them, and replacing Adblock Plus-esk rules with ones that use $$div, etc. and it still randomly fails. Very odd indeed. Will test Opera more closely as well to see if it's failing at random too.
Unexplained-Mysteries failure in IE9:
And yes when filtering fails the assistant is nowhere to be found.
Unexplained-Mysteries failure in IE9:

And yes when filtering fails the assistant is nowhere to be found.
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