The tread was blocked by security module Browser Security). I disabled it and the problem was gone. But just like yesterday eveything is fine now whit browser security enabled. I had a email from support and i can't repoduce it for now.
The filters i use are: Base filter, Tracking Protection Filter, Social widgets, Annoyances filter, I don't care about cookies, Anti adblock kikker Reek, Dutch filter and Easylist Dutch.
I'd highly recommend removing the Anti-Adblock Killer | Reek filter as it hasn't been updated in over 2 and a half years now and using it *can* cause site breakage. The Annoyances filter is the recommended substitute for the AAK filter.