Can't add a game to "Owned Games" stack

I can't add Radiant Silvergun to my Owned Games stack. When I click Save & Finish it... well... neither saves, nor finishes.

unfortunately, adding or removing games from stacks does not work for anyone at the moment. they are supposedly working on a fix for this though.

Site-wide bug...

... I kinda feel stupid for not guessing that immediately.

its ok. happens.