In reply to Strachan:
Interesting about a separate file, thanks; I wondered if the software did that for photos editing purposes. In my layperson’s thinking it would explain how for example a keyword could be added to a photo I hadn’t edited if the software couldn’t correctly or timeously associate the correct edit file.
Connected to this, I had also noticed that the file name displayed in the info box could be wrong for the photo being viewed/edited - eg when minimising a photo to the thumbnail version in library it sometimes briefly “blipped” to a different file name.
When discussing with Apple I mentioned the wrong file name being displayed at times and it was hinted that there could be some lag in processing. If a separate file of edits has to be associated with a photo to view/re-edit or whatever and it got it wrong, that would explain the somewhat random errors to keywords, etc.
Hopefully, Apple will get to the bottom of the problems and issue a fix for all those that have Macs as it can’t just be two machines affected!
I’ll wait a bit longer yet before I decide whether to move over to a Mac, or just buy another windows pc. I don’t really want to commit to a Mac though if it has random errors caused by the software!