Seeing as we asked all these in your previous thread and were ignored I don't hold out much hope, but here goes ...
The information here we have is a little vague. Could you tell us the following -
- The Phone you are trying to use
- The Operating System on the phone (Check your [system] settings menu)
- Are you getting any specific error messages at all? How about error codes?
Also if you are running a specific ROM, might be useful and what exactly you mean by 'change to another song', because for me and many others, pressing the 'next' button, or manually selecting a new song works fine.
At least now we know which version of the app you are running - the preview release ... unless you reverted to the market version?
Listening on Windows, Android and Sonos. Tweeting it at @davelicence