[vbat99]

Just so you both know this have NEVER happened till I installed the latest build. 

However it is movie specific and the only thing those movies have in common is the title length?  Both are very long titles?

Added...

I tried your suggestion and still says download trailer when the trailer is already in the folder

BTW...I don't use Kodi

So are you playing these though Media Companion?

Then after manually putting the trailer file in with the movie with the naming <moviename>-trailer.<extn>
Do a Refresh of all movies, and select the movie with this issue. The Play Trailer button should become active.

Otherwise, past me the full path and filename for this movie and I'll attempt to reproduce.