I had set the option in the 'Advanced Options' to 'Both' and then forgot about it.. The first time I tried to call up the 'Say Again' my FS9 immediately disappeared - in its place was the ATC log window. I also got the 'Say again' dialogue, as I'd wanted, plus the PF3 email error reporting window, which I filled in and sent. I thought that FS9 had just minimised when I wrote what I was doing - in fact the process had closed down completely. Sad end to what was towards the close of a long-haul flight
I have reset the option to basic 'say again' ....
Martin