I'm in the same boat but think the state may have processed the return but not the payment yet. I still think if you approved the payment for 4/15 and your return was accepted (aka postmarked) by then that it should still get there "on time". I'll give it a few more days to post before I start to panic. IRS just posted today and I had that approved for 4/15 as well (granted thet is also when I filed)
