You have discovered an error in Z88Aurora? Tell us the horrible truth!
http://en.wikipedia.org/wiki/List_of_ar ... of_inertia
Here is a link to the spread sheet I created using the equations above.
Circle - I got complete agreement on the "Circle" type.
Tube - On the Tube type, the Iy, Iz and It were off by nearly an order of magnitude.
Rectangle and Square profile - I got complete agreement on everything except "It". It which was somewhat off, although the equation, I'm using has some approximations in it. Maybe yours is better.
I-Beam - I got the same values, but its appears the Iy and Iz are swapped. Maybe, I've swapped them, but I'm being consistent with the Rectangular and Square profile version. So I think one set or the other are reversed. Also the ymax and zmax are zero on your screen.
Also, I can't seem to find a reference of what Wt is? Could you point me to some way to calculate it for all the section types?