Help with Subtitles

Can someone help with subtitles.  I have a couple of French films that have English subtitles as  srt separatefiles.  They work with various other apps on my Mac.

The .srt files are names exactly the same as the main movie file apart from the.srt extension.

 

Mesrine.avi

Mesrine.srt

 

 

I can access the subtitle menu (hold ‘Select’ while film is playing and skip over to the subtitle heading’)

The .srt file  ‘1  Mesrine.srt’ has a tick next to it.

 

What next?  When I go back to the film or restart the film there are no subtitles. 

How do I get back to the film once the srt file is ticked in the subtitle menu and have the film showing subtitles?

 

I have tried this on two different films but with no luck.