Guild Wars 2

http://wiki.guildwars2.com/wiki/Thaumanova_Reactor_Fallout
This link provides the background info on this event.

There are 4 elements in this puzzle, and the water element is the part that is currently known to be bugged. The player cannot interact with the water crystal after its surroundings are neutralized. There is no interact option available to interact with the Matrix Cube Key which is used to interact with 3 other elements of Fire, Ice and Earth.

I play on the Crystal Desert server and am having this same issue. I have the key, but am unable to interact with the Water Attuner.

cerulean moth.2743:

I play on the Crystal Desert server and am having this same issue. I have the key, but am unable to interact with the Water Attuner.

I know it’s really annoying that I’ve the key stuck with me for weeks now. Unfortunately, the Sept 18th patch didn’t cover this event with some of the others that got fixed. I ran through Metrica Province again just to verify. I also noticed that GW2 Wiki has updated a note about this bug on the Matrix Cube Key – http://wiki.guildwars2.com/wiki/Matrix_Cube_Key

I went and followed the exact instructions on that site, including the bit about having the Clean-o-matic. I still cannot even interact with the water attuner. Hope a solution if found for this bug as I would like to do this event!