Ed wrote:
Welcome OldGrantonian! Can I call you OldGran for short?
That's very sweet
Can I call you "Eddie Baby"?
Ed wrote:
You might have found a bug there.
My first two attemps were with manually entered files that had been generated using Puzzle Tiger. SS made no complaint about the legality of these files, but Lock > All {xy} produced an error.
I tried importing two old puzzles from Sumocue, and these worked fine.
So it's possible that the bug that you suggested only appears with manually entered files.