Did you guys do another update? Why is this happening?
Normally when I start typing a list will appear to choose the card to add, but now nothing appears.

I'm having the same issue. I noticed it first while trying to set up trades.

Which phone / browser are you using for this? Seems to work for me on the android browser.

Chrome on a Nexus 5

FYI - It's working on my iPod touch (iOs 7) with chrome.

Chrome on galaxy S3.

Okay, if I switch to a different browser it works fine. I switched to my phones normal browser. Something about chrome apparently.