Bugged Incompletable Missions

[WhisperXer]

I've gotten a few missions to defeat some leader and all his crew that wouldn't complete after I defeated all of them. Searching for an hour or so, in every nook and cranny, just to see if I missed any enemies and/or a separate path to go. Each time I never found another path nor more enemies. The quests were just completely broken. Is this normal or am I getting the worse luck?

[RikOz]

I had something like this happen yesterday. I finally found the culprit - a mob had spawned with the upper half of its body inside the geometry of a piece of equipment, and of course I kept getting the "target blocked" message when I tried to attack him. I was about to summon a GM to fix it for me (did not want to have to restart the whole long mission over again), but I finally found an angle from which I could successfully attack.