Haunted.
Appropriate I played it on Halloween last night. Dropped into Hazard Glacier/Collectors/Gold (on PS3, happy happy joy joy!). As I am still on the loading screen, I hear the message about a teammate going down. That's always comforting.
I load in and see a FQE. And that's it. Check the scoreboard. Only shows her. And then I hear a flamer sound effect, but I look around and see no vorcha or geth trooper. Then I hear about a teammate down again, but all I see is a living FQE. Wonderful. Flamer guy is invisible, meaning I also can't revive him.
Had a few hairy moments that match where the FQE went down and bled out, so I basically felt like I was soloing because I couldn't see anyone else. Felt so bad when flamer guy would go down, to the point that I put on my mic and sincerely apologized. Explained I wasn't trying to be a jerk and ignore him, he was just completely invisible on my screen, and therefore impossible to revive. I still felt like a ******, though.

We made it through. And I was surprised to see the match was actually full, so I didn't just not see the flamer guy, but the 4th was invisible, too. Bailed outta that room for an invite from Revolution... good timing!