Quote - it appears the depth-cue thing must have some bugs. for example, in your scene display (pose room), when you drag your mouse pointer over the depth-cue icon, what name or title appears to the left of the render tab?

 

The title of the file appears there.

Note, however, that when I press the icon, I do get the depth-cueing effect on screen.  It's just being exported to the TIFF, either from preview or from P4-render, at least not with the complex scene.