Yep, looks like it's working for me too now. Thanks for the quick fix!

sebi wrote:

It's the number of cards in the inventory with those exact details (printing, condition etc).

Ah, then it's not working correctly for me - I'm choosing lines specifically from my inventory, so I definitely have more than zero of that exact card, but it's still showing 0. Call this a bug report?

Oh, neat, I've been hoping for something like this! Question on one of the interface details - when I pick an edition of a card, the inventory count goes from a single number to an X/Y pair (some of them are X/Y pairs already). Y is obviously the total owned, but what's X? It's not the number available, and it seems to be 0 most of the time.