I ran through the Garnet Sanctum jumping puzzle yesterday and collected both the top and bottom halves of the Mistwrought key. I was able to unlock the vault, but the Enormous Mistwrought chest at the end cannot be unlocked. I returned today with the key halves and had the same problem. I have not done this jp before, but I have done the same one in other borderlands without issue.
[ASAP] Zerg ~~~ Starkar