This is a problem with the flash player. The flash mp3 player was developed by 1PixelOut. Support regarding this issue can be found at their website - http://www.1pixelout.net/code/audio-player-wordpress-plugin/
First, download the latest version of the plugin. Then delete all of the files in the wpsermons folder except for the uploads folder (so you don't lose your uploaded sound files). Then replace the files you deleted with the new files you just downloaded.




