Yes there are problems with seeing mobs. I've had frogs apear right on top of me in PoS and also warp to me when they apeared far away and kill me in about two seconds. Lots of bugs with this new graphics engine.
Well, since most mobs are somhow to easy to level and skill up on they probably nerfed them away completely....
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"The truth speaks for itself" John Sheridan, commander and military governor of Babylon 5 "And if that sounds like a threat - it IS" Benjamin Sisko, commander Deep Space Nine
Hehehe the mobs are falling through the world. They are under your feet and, if aggroed, will pop up and attack. Otherwise they go their merry way beneath the scenery. Great eh?
It does make for some challenging pulling. You can often still see the targetting ring on the ground, but no mob. Suddenly the ring will vanish and pop up (with the mob) elsewhere.
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"God created man from a handful of dust, and he created woman from that man's rib. And these two together were so stupid that they weren't on the planet five minutes when they managed to get a curse put on all future generations. Nice work." Pat Condell