Hi, thanks for pointing that out, I've just moved them to a different directory, and then tested current layout books, no problem experienced thus far that I can notice. They seem to have accumulated for the past 18 months, and have taken up up to 10gb of hard disk space. So if they're not essential I would really like to junk them. Will try the re-naming and then open to view.
Will update this forum with any developments.
AC 6, through 27
iMac 27' 3,1 GHz 6-Core Intel Core i5
500GB OS X12.7.3 Monterey