Hey juice,
cheers for the quick response. The mystery is why it suddenly started doing it - I’ve always named the files outside of Plex before importing, never used Fix Matching. Never had any issues to now.
For the times when things didn’t work out I was, without knowing the name, doing my own Plex dance to get the files to show up correctly. -nice moniker by the way!
I’ll try adjusting the agents as you suggest and take the offending files out for a dance! and see where that gets me. 
