FMOD and www error in recent Unity builds

I'm loading up audio using WWW using something like this:

 var www = new WWW("file://"+fullPath);
 var clip = www.GetAudioClip(false, true);

This worked fine up until a few Unity versions ago. Then I started getting some emtpy errors in the Console. Now on the latest, I can actually see what the error is:

 Error: Cannot create FMOD::Sound instance for resource ȜB
, (Operation could not be performed because specified sound/DSP connection is not ready. )
 UnityEngine.WWW:GetAudioClip(Boolean, Boolean)    

It's weird that I can't notice any actual problems playing the audio. Anybody else see this? Any ideas how to work around it?

The best I could think of is to add the AudioListener higher up in the script execution order (before this loading audio code happens) but I couldn't find it in my sprawling list of scripts.