Resolved. It was the favorites.db3 file causing the issue. Once deleted (along with the komplete.db3 file) all was ok again.
For some reason all of my NI content has just disappeared. So if I open up Maschine, all Project, Group, Instruments etc are all blank. Nothing there.
It happened after saving a Massive X patch to my user area. Then when I opened up Massive X again all of the patches (factory) were missing
All of the content is there which I can see on my hard drive. I have tried rescanning the Plugin and Library, but there is still nothing.
I have tried reinstalling the applications like Massive X, but again no presets.
If I open up Kontakt in Ableton, again no content.
Can anyone help with this please. I am using a MacBook 16 Pro 1, and NI natively.