I am also encountering this issue. I've double checked and all of my forms are available and supported. I followed the advice above from @Kat to remove the state return, re-did it, and now want to try filing again. But I'm now being prompted to pay again when I paid during the first attempt. I don't see a way around having to pay a second time. This is a mess.
I sent my return to an agent and ref number is 749332.
