Thanks VolvoGirl. Checking e-file status did reset it so that when I reopened the return it showed the original "splash" screen that allows me to select "Amend a return…" and then applies the changes to the return as it should.
Unfortunately, something is going whacky with the state return (Arizona) as it shows me getting a large refund instead of owing more like it should. When I start the amended return, instead of resetting the state to zero in the refund monitor it's changing it to a $1,500+ refund. I didn't e-file my state return, so perhaps that's causing some issues. I'll have to delve deeper into the state file to see what is going wrong. The state return itself looks right, but the state amended form doesn't.
