Hi Andrew, It would seem I was chasing a red herring. While working with a file in the main BiaB program I got the registry errors there as well. It didn't take long to find that the songs generating the error used Amplitube. I reinstalled Amplitube and no registry errors at all.

I do indeed get the message shown by you and all seems to be well now. Having loaded a dozen or more tracks in to the main program or via the plugin in the latest version of Logic Pro X (10.4.7) and the latest Garageband (10.3.3)

Tim.