(edited by Woljnir.7810)
Loosing boss chests when host leaves group.
IMHO, this is a bug that should have been fixed a VERY long time ago. Currently, the instance will remain open until the opener changes characters or leaves the party — not just leaves the dungeon, but actually logs out and then back in with a different character. I regularly log out, leave, and then return to dungeons I’ve opened.
To defend against openers doing this either deliberately or accidentally, you really should turn on all the “automatic looting” features for GW2. I’ve had them enabled for so long, I no longer recall what they’re called. I think there is a “loot all” button on your options for this. Second, you need to instantly loot everything whenever you’re in a dungeon. The button just helps you do this.
The other thing to do is to always file a petition on the opener when this happens. He’s essentially griefing your party and can get banned for doing so — especially if he has a history of doing that.
Of course, if you haven’t yet done so, file a /bug report, too. I have long ago, but obviously this isn’t considered important enough of a bug to fix. It should be an insanely easy fix, too. They already keep the instance open as long as someone is inside it and close it when everyone is out. Just remove the additional code that is causing the problem: the part that checks for the opener swapping characters or exiting the party.
Oh, the part of the instance where the player has to press the “OK” button to receive the tokens is also a bug. Why exactly is the player being forced to press OK? Do bad things happen sometimes by pressing OK? No. You get money and tokens. Can you press “not OK”? Nope. No such option. There’s only an option to wait and it serves no purpose but to create the potential for the opener to kill the instance under people.