When trying to access the wargame rank list from a game entry I get "Error: Could not create geekitem //wargame" . For example from Twilight Struggle on top of the page next to the star ranking there's "Board Game Rank: 3 Wargame Rank: 1"
Pressing the 3 will correctly take you to the general ranking while the pressing the 1 will give an error message.
Seems to be working now. If it doesn't for you, the best way to proceed is to clear your browsers cache and try again. I'm using Firefox by the way. The link should be to: browse/boardgame?sort=wargamerank&rank=1#1 instead of browse/wargame?sort=wargamerank&rank=1#1