Well, I finally figured out why it wasn't working with the Blockchain.info JSON-RPC API. It appears the JSON-RPC API returns Bitcoin values rounded to three decimal points (!) So... the smaller orders I was testing with returned 0.000 received when they should have returned 0.0001... There was some other weird behavior with the blockchain API so I need to test more thoroughly before I push out a fix.

I also have some other features (including a timer and a bit cleaner interface) and bugfixes that I'm hoping to roll out in the next day or two.