I found my .quad file... for various reasons I had set my hidden folders to be visible, and the quad file was in its normal place along with other .quad files. But apparently Win 10 (and 7 & 8 as well) expects profiles and quad files to be in the Virtual Store - and since those files are not where they're expected to be the wheel keeps spinning.
When I called up the .quad file into the GUI and right clicked on it, I got the graph. As expected, there were just three curves, cyan, yellow and black.