So, either I am totally blind or there has been no report on this issue so far. Anyways, when/if you play with a friend or have someone else in the same map, and you try to pick up some items that the mobs they killed have dropped, your skills will stop working(and I believe you cant talk to npcs or go in portals - not sure). You can fix that by picking up items from mobs you have killed and cc etc. maybe there's more to this bug, but I havent really figured that out. anyways just putting it out there