I've just got a 32PFL3008H/12 TV and when I play a video from a USB stick (not one recorded from the TV itself) I cannot get subtitles to display.

I can select the relevent .srt files (or even a different srt file) and turn the subtitles on and off (or at least that's what the TV & menus tell me) but no subtitles are actually displayed.

Any ideas?