Thanks for your response. I've re installed updates 705 and 704, restart and, no change.

As Logic starts up, and alert advises that;

"While verifying Audio Unit compatibility, Logic Pro X encountered 1 Audio Unit plug-in(s) which did not pass the Apple AU validation. These plug-ins have been excluded from further usage in Logic Pro X to prevent possible problems or crashes. You can start the Plug-In Manager now to review the validation results or continue the startup process"

I have reinstalled the Logic's sound library. As before, the only exception in the listing is the Band in a Box that can't be verified.

FYI, in Logix, I have reviewed the System and Logic preferences for in/out preference and everthings seems ok.... Focustite in and out.
The same holds true for BB.

BinaB 2023 for Mac all updates current.
Focusrite Saffire pro 40