It seems like more than 2 weeks to me!

Someone recently, in a post I should have bookmarked, suggested that the problem had something to do with the way Steemit requires the exchanges to hold all their Steem in their Steemit accounts. It's not so much a technical problem that needs fixing as a protest from Poloniex to avoid supporting Steemit as well, since it's a bit different from other coins.

May be mis-remembering that.