(Using ProSeries, Network Version)
When efiling federal and state returns (previously error-checked with no errors) from within the return (using the lightning icon), the federal return efiles just fine; however, the state returns do not (error: they don't convert and efile). I go back into the return (there are no errors), again hit the lightning icon, and now there are two boxes to check for each state. So I exit the program, restart it, go back in to the return, hit the lightning icon, and the returns file just fine. So far I've seen this behavior on both individual and partnership returns.