Make sure Stereo Tool has the right permissions so that it can see the XML file. I've seen people have issues because the application was not able to read from network drives, or what have you. So see if running as administrator works, or moving the XML to a different local folder.
Thanks for the suggestion! I tried this, moved the RDS output to c:\data\rds.xml and gave 'Everyone' in Windows full read and write permissions to that folder. Unfortunately, no sigar. (and no working title announcements either
I should mention that even when I manually enter an artist or title in Stereo Tool it also doesn't appear to send it to the Shoutcast server.
I vaguely have a feeling it might have something to do with Shoutcast v1, as that actually doesn't really support a separate artist & title, just a "current song", but I guess only a developer would be able to tell this for sure.