With the installation of the previous two builds of MadSonic, Microsoft Security Essentials is detecting a java exploit. If left quarantined MadSonic does not run.
Upgrade to the latest version of Java. I'm on the same build (3280) and just completed a scan, with no errors. I'm using AVG and the most recent version of Java.
After 4.8.beta1 (build 3206) , subsonic gives errors, and doesnt show my music folders, only network folders. So im back to 4.8.beta1 (build 3206) , and all works fine again.