.srt subtitle file loads but does not display

[d866238]

I have a video which has an associated .srt file. The file loads, and the name of the .srt is displayed above the movie size in the player. I can also pull up the subtitle editing window and see that all the subtitles seem to be recognized correctly and have the correct associated times. Nevertheless, the subtitles are not displayed on the video. The video is a .m2v file. I have the subtitle color set to yellow and font set to Arial 48 - so they are hard to miss. :-) The subtitles come up fine on other videos, but not this one. Any suggestions?