This seems to be a known issue that is being worked on [https://twitter.com/coinbase/status/314167537501868032, https://twitter.com/coinbase/status/314173853028986881, http://www.reddit.com/r/Bitcoin/comments/1anvaz/warning_avoid_coinbase/], but is troubling how there is no indication when this problem will be solved. A disconcerting reminder that unless your bitcoins are in your wallet, they aren't yours!