After latest updates, some movies come with "there was a problem playing this item"

Hi,

I just updated the latest server version on my mac and suddenly, some movies become unreadable on any device connected. "There was a problem playing the item" message comes after 5 sec the system trying to launch a movie.

I just checked if there were some issues in the files by launching them with VLC and I came to the conclusion there is no damage on the NAS.

I checked if it was the codec, but it is not (some files in H264 still opens, other don't)

Any clue or same experience within the Plex community ?

Thanks

r.