Well hi.
I have restarted playing Guild Wars after a whil and wanted to do the living story, just to find myself annoyed by a glitch.
I found out that when you open a chest and in the midst of opening the chest the tower gets contested the chest wont give you loot, nor will it count towards the balloon achievment. Also, the chest stays open forever, with no means to ever loot it again.
This is annoying since it happened to me a few times already. And since it doesnt count towards the 30 balloon chest loot thingie achievment, there is no mean to get that achievment anymore.