[Graham68]

Also I am still unclear why for Graham there has been a change in behaviour between 17.5 and 17.6.  FFmpeg, the heart of the player was bumped to 3.1.11 in 17.5, so the file parsing could be different from 17.4 onwards. Maybe you skipped an update?

What could be helpful Graham is if you could upload an example file that does not play and PM me a link. You need to get to 10 posts to be able to do that, but that isn't far.

I can't get the file from Geeeronimo to play from library on any verison I have tried (v15 onwards).

played fine by Kodi until some day when it refused to do so

Any chance you remember when in the last 6 years that was?  

OK I'll keep posting until I get to 10 or I guess I could pop it on dropbox for a while? 

OK I'm at 10 posts.  Is there a facility here that I should be using or shall I just use dropbox?