Hi Bruce
Sorry for wasting your time
I was updating C8 with IG2, Draw, StringTheory and NetTalk7.33 and have decided to move to C9 so applied the same to that - or so I thought.
Just checked C9 and it was still on NetTalk7.18.
I have now installed NT, and program compiles and runs fine.
Apologies again - it was a simple thing I should have checked before rushing into typing.
Cheers
Keith