There is a pretty major bug right now that doesn't let you (or anyone else on the team) resurrect another player inside a dungeon instance. I am not sure if it affects trials as well.
Here is how it occurs:
1. Player A dies
2. Player B tries to resurrect player A but gets killed right before they complete the resurrection
3. Player B will now have the resurrection bar stuck on their screen until they reload UI (see screenshot below)
4. Player A will still be dead, but no one on the team will be able to resurrect them anymore (it will say "Cannot ressurect player, player is being resurrected")
This bug is especially problematic because even if you wipe, and restart the fight, the player who died initially will still be bugged (no one will be able to resurrect them if they die again). We tried reloading UI (everyone in the instance) and we still couldn't resurrect the bugged player when they died. It seems the only way to clear the bug is to reset the entire instance.
I've had the bug occur twice now this week.
Screenshot of bugged UI: