1. What is the version of uTrack24 you are using?
2. What is the version of uTool you are using?
3. Do you have the error when you press the Play button or when pre-loading the song.
We might have to look at your content to understand where the problem is occuring. Could you upload the song somewhere and send us the link at firstname.lastname@example.org
If you do not have the space, just send a mail and we will send you a link where to upload the content.