I would like to offer a sincere apology to the author. After noticing the update, I saw the author's response to my post. The author did indeed respond to my subsequent support questions/comments. I am not sure why the subsequent responses didn't make it past my spam filter even though the original did, but that is clearly not the author's fault. Because of the perceived lack of a response by the author, I hastily posted my previous review. I have unsuccessfully tried to have that post removed by versiontracker.

I have tried the latest version and have not yet had any issues. It is indeed a challenging puzzle.