since CT2.2 I have seens mobs in locations that they shouldn't be at...example:
I loged in in Oren and got killed by one of the helpers of Orfen few days ago.
I doubt it. I have seen Ketra/Varka mobs in Goddard appear at the same time/location as chars that has used BSoE, mobs warp thru walls in the rift when ever a tank does aura hate and there are mobs in the other room or someone casts fear on a mob.
I have seen party members get ported from inside a catacomb to the roof of the catacomb, but sill under the ground.