I don't work with 3D graphs, but here goes:
I opened the 6.1 vesrion in 7.0 (and in 6.1, both XP), and got a popup saying that there was an error in loading the control and that a newer version is needed (it wasn't). Then, I had to go into the diagram and make the control visible. I also had to add a cursor because there weren't any.
What I saw was that inverting the axes caused the cursor to appear not where its hot spot was and it caused it's label to go crazy. This can best be seen by giving the label a colored background. When the axes are inverted, the background seperates from the label.
I had some trouble determining whether the cursor is moving properly because it could only jump between the points at the end (0 and 1) and it was difficult to get oriented with all those lines.
___________________
Try to take over the world!