Is there an issue with cross domains? Is the server blocking soundcloud – like a blacklist of ip addresses?
create a phpinfo() page to see what is allowed on the server and what services are running / disabled.
Version of php are you using?
Are you hosting on an apache server or iis?
Alternatively turn off all other plugins to see if the problem still persists.
This plugin works really well on my site and others in the past. There is nothing wrong with the plugin it works perfectly – see https://digitalpilots.com ??