HP35S flag 11 not working

[Dieter]

(01-22-2019 06:01 AM)John Colvin Wrote:  After F= H and then SOLVE R, I should get a prompt for A but the SF 11
instruction is ignored and the program goes directly to the equation.

What does this mean, it "goes directly to the equation"?
Do you see "A=πxR^2" instead of a prompt? Then clear flag 10: CF 10.

Just a guess. ;-)

Dieter