MP3's not playing/downloading at front end... but are in back end

The mp3's that are uploaded to my blog aren't playing or downloadable as they should be. They play in the back end, but not the front end. Can you please tell me what is happening? I've asked BlueHost if they can sort it their end but they said this: "This issue does not seems to be related to the server instead issue seems to be related to coding or site design. So contacting word press or a developer is best recommended"

Here's an example... scroll to the bottom and you will see that neither track is accessible.... and here too - this latter one has been up for months and I am sure it used to work..... No one has told me it doesn't work .... Please help!!

I'm uploading mp3's to media and setting as link
I've also checked by changing themes and that didn't change things either