Sorry about the delay in replying; I’ve been really ill and unable to use the computer.
Sorry also for creating a new thread rather than replying in my original one, but the forum wouldn’t allow me to reply; it kept saying I couldn’t reply until I’d logged in, even though I’d logged in repeatedly. It did this in two different browsers and after a reboot.
Anyway, the problem seems to have resolved itself, and as far as I can tell, it was caused by another piece of software anyway, the one I was using to get a nice piano sound (iGrand).
So thanks for trying to help me and wish me luck!
Happy to read it works now, and happy to read the Xkey was not the cause of your issue.