I was hoping that the restart button would solve one minor problem but it doesn't.
Sometimes I have PMS running and will browse into a folder with movies and subtitles. Say Episode 5 does not have subtitles. I realize that they are out, and I download the Ep 5 subtitles into that folder. Rebrowsing into the folder does not update the subtitle status. Even restarting PMS with the button does not update the subtitle status. The only way is to quit PMS and restart completely.