Thank you for that link. I did 'search' for any reference to Sony before I posted here and nothing popped up.
I had been using Sony Audio Editor since 2011 happily alongside JRiver MC with no problems. Whenever I had to upgrade/reinstall Windows 7-10 JRiver was always one of the first progs to be installed so it was always in place before reinstalling/running the Sony stuff.
As someone mentioned there is only one JRiver but there are a number of audio editors I could use but I'd rather not have to learn another if it can be avoided.
I had tried the Ctl/Shift to run Sony as well as clean reinstall after registry cleanout, run as Admin, etc, and every other solution I could try including a Windows 10 reset over about a week before Sony support finally came back recommending the removal of JRiver. Their forums were no help at all. Interact rides again and proves it's a great support vehicle.
Seems if I upgrade to JRiver version 21 the problem may have been solved and I can use both again?
I can't live without JRiver MC but there are other audio editors I could use.
Cheers.
Peter