After un-mixing vocals and dragging both clips into the project, the original track won’t play in the project. The peak image is there, the file shows in the pool, and the source file is in the folder, and from there it plays. Also none of the SpectraLayers layers play (or solo) from the SpectraLayers window. Is this normal behavior?
Yes, as the original track was unmixed. So all of its content was transferred to the Vocals and Other layers. However if you remove SpectraLayers as an extension to your original audio clip, the original audio clip will playback unmodified.