> -My account balance went from 10 to 0 to 10
That could potentially indicate a database infrastructure problem. Eventually consistent databases can issue responses that appear to travel backwards in time. And [1] says this:
Coinbase uses MongoDB for their primary datastore for
their web app, api requests, etc. Coinbase is a
decentralized, digital currency that is changing
the world of payments.
[1] http://www.mongodb.org/about/production-deployments/