QTR-Quadtone RIP

I have saved my image as an 8-bit, greyscale, non-compressed TIFF.  I am using Photoshop Elements.  Some of my TIFF's are now showing in the preview pane of QuadtoneRIP.  

I did not have this trouble before.

What am I doing wrong?






(Before I did have trouble with a 16 bit file printing an enlarged portion only rather than the entire image.  As soon as I converted the image to 8 bit it printed normally.)

Larry