I think it happens 1/6 dungeons I enter with group members.. either way it's not the most crippling bug ever. Relog. of course for some place that counts on you being able to rez such members like VMOL... it can be what keeps a group from completing it. this bug is probably never going to be solved, and it's not a huge deal imo because most of us have just accepted it as a normal thing at this point. Just like in PVP some people show as if they're dead... u can't target them...but they can attack and kill your entire team... Now THAT bug... is something worth fixing.
Just yesterday in Blackheart's Haven we actually had this happen with our party. We were at final boss when one of our DPS had to leave. Another guildie joined our group but when they got to us they were invisible to 2 of us but another person in the group could see them. Reloading UI did not fix the issue.
I have had this happen in various places and typically the only thing that "fixes" it is relogging.
PAWS (Positively Against Wrip-off Stuff) - Say No to Crown Crates!
Yeah, I'm still getting this too. First dungeon I did today (which was actually only a few minutes ago) and I was invisible to the rest of the other group.
In this case we were doing Spindleclutch. I was apparently a replacement for someone else as they were already inside and nearly finished with the dungeon. Naturally ended up getting the "Jump Failed. Instance Full" error message so I had to port in using a wayshrine.