I found a way for the last bug to break the loop. Simply remove /adventures string from the Url and you are able to load the main page with professions etc.
I have the exact same problem. When I came to my first arcane chest I opened it with the silver gauntlet, then I mistakenly quit the window (after seeing inside was only a pearl) and the gauntlet vanished from my inventory - but the chest is now not usable again (needs the glove) and I cannot cancel or restart the quest in…