There is a problem sometimes when you enter/queue into nexus you will not see group members on PS3 this has been confirmed atleast.... let it be known if this happens on the PC/PS4 Yet (taco bell hookup YOLO) XD
I saw this issue happen in the Cathedral duo this morning too. The entire duo the player I was playing with kept blinking in and out and for most of the time I could not see them at all. They could see me fine though. I was in dps stance and they were in troller stance. I was getting power fine since they could see me, but I'm not sure if I had been in healer or troller stance if I would have been able to do the same back.