Hello All,
well, I have tried everything suggested so far without success. I am now of the opinion that I will have to uninstall BIAB and re-install from scratch including all Extra Paks\styles etc.
In order to do so ... on a MAC .. is it simply a matter of removing the BIAB folder from the Applications Folder and re-installing? ..or is there a specific removal process?
Thanks to all for your support.