I got something to work.
I don't know if completing the process described in my prior post was necessary, but it looks like my line 11 problem was a result of having earlier entered the correct amounts for line 18 even though I don't want to defer payment.
So...I zeroed out all my self-employment income and saved it. Went through the self-employment tax deferral questions. Went through final review. THEN went back and entered the correct amount for my self-employment income. Went through the self-employment tax deferral questions. Went through final review. This allowed me to enter line 18 again, and I entered 0 for line 18 even though that is not correct. Apparently, it doesn't matter since I don't want to defer, and the error is gone. Huzzah!
