I have uploaded the changes from CVS and run further tests.
I can now play all the games and all the games are showing in the grade book with scores and grades. No error messages are being generated.
For some reason the Sudoku glossary and Picture Glossary games took two plays before the result showed in the grade book, possibly because the first attempt was identified as continuing a previous uncompleted game.
For clarification I have attached a picture of what was showing in the glossary in my previous posting, but it looks now like everything is fixed.
Once again many thanks for your help.