I recently bought the sudoku program, my compliments, it is a great program. In the help I read appearance and library files come with the program, but when I opened the respective dialogs, I found none. I discovered they weren't located in the appearance and library directory but in the sudoku directory one level up. I moved them and now everything works.
Maybe this 'problem' (minor inconvenience) occurred because I did not install in the default directory?
Anyway, problem should be easy to locate and fix for pappocom (love the name).