Market order stuck on pending

[crypter]

Running 0.4.15-1g729987b on OSX 10.9.4. (The client asked me to update and afterwards that version number appeared on the login screen - the current build on bitshares-x.info is still 0.4.15, so I'm assuming this is the most recent version.)

I've been trying to buy a small amount of bitUSD at the market rate for a couple days now. The order just will not go through. I've tried rescanning the blockchain without any results.

Any ideas?