Twitter cards previously approved, and still show as approved on card validator, but don't show up when tweeted - any idea why?

DrakeAdam · 2013-12-20T21:56:19.000Z

I have previously gotten *.greatmountainmusic.com approved - and when I check in the validator, it still says that I am approved…However, if I tweet a link such as http://www.greatmountainmusic.com/eventdetail.asp?t=i&m=5&d=17&y=2014&evt=1 - no twitter card appears in the summary if I expand the tweet - any idea why?

rchoi · 2013-12-21T00:30:12.000Z

Looks OK now. Let me know.

DrakeAdam · 2013-12-21T03:57:45.000Z

Looks great. Thank you.