For videos longer than 15 minutes, the video embeds on ChinesePod default to Flash player. This is fine because flash is quicker to load longer videos.
The downside is that flash does not support full screen overlays (such as subtitles and the CC button).
This means that users watching a video with subtitles overlays will find that when entering full screen mode, the subs disappear. However, watching at the smaller size does display the subtitles.
To avoid this issue, second click on the video and choose HTML5 video from the list. That way you can watch us in glorious full screen with subtitles.
For an interesting Wistia blog about the pros and cons of Flash vs HTLM5, click here.