Submitting blocks worked for a little while and stopped working again. I was also getting "Error: Internal node error" when sending a transaction. Can't pay any miners because the simplewallet stopped working? It worked a couple of times before but now all I get is that error message. Any insight by the dev?

Config is the same as it runs on the official main pool. This is a bad start. I might wait until all the bugs are fixed before wasting anyone's hash power.