I find that sometimes in groups, nobody can loot the mob that dies (when I group I set it to free for all and normal policy)
it's kind of a pain when no one can loot in DP when you're duoing mobs specially after taking 20+min to kill the bosses. This happens rather frequently while in groups. (At least from what I hear anyway) sometimes I don't even loot though but a legion mate today couldn't loot in eltnen, and the body wasn't even lit up for me to loot --- and then when he killed the elite boss, he couldn't loot that body either (which made 'em quit and just go to bed since invisible mobs killed 'em)
So not sure where the problem is for that :s