Well common sense wise pulses, blasts and even auras shouldn't be stopped by other models blocking LOS, that's just silly. (though terrain should stop it) But then again its a game of magic and other nasty things, so anything is possible. Maybe Nicodem can sniff out the corpse markers.
Dafty: Maybe the intention was that markers aren't models thus can be effected by more effects, ex: pulses, you don't know till one of the designers says otherwise, or an errata.
Thanks for the responses, I was wondering if there was anything I missed, looks like there wasn't.