One important thing we discovered when testing MovieNow ... your KODI library must be CLEAN of .nfo files and other stuff that was left over in older versions of KODI. After a very thorough clean of my movie files, the posters started displaying. So, the ONLY thing you should have in your movie folder is the movie itself (movie.mkv) and maybe a subtitle file (movie.srt). That's it! Anything else might cause issues for posters to display.
Many, many thanks to the author for being so patient to solve the issues.
Now, if anyone (RP4 gurus) knows WHY I can't get HDMI 1 to display anything on the 2nd TV, please share your knowledge.
:~$ tvservice -n
:~$ tvservice -l
2 attached device(s), display ID's are :
Display Number 2, type HDMI 0
Display Number 7, type HDMI 1
:~$ tvservice -s -v 2
state 0x6 [DVI CEA (34) RGB lim 16:9], 1920x1080 @ 30.00Hz, progressive
:~$ tvservice -s -v 7
state 0xa [HDMI CEA (4) RGB lim 16:9], 1280x720 @ 60.00Hz, progressive