I have the same Infopath error: "Some rules were not applied".
The problem is in "K2 Action" because this use web service data connection.
Well, look in smartobject services (K2 Workspace ---> Management Console)  if exits a "Dynamic web services" service. If not exist add it and select in dropdown service this:

k2.backpearl.UKEU.ServiceObjects.DynamicWeb.ServiceBrokers.ServiceBroker

So... I added this services and after I don't receive any infopath error.