When comparing principal stress vector plots from a nonlinear study against those from a linear study, it seems that the nonlinear vector plots are displaying incorrectly.
The simulation setups are identical. As you can see from the attached pictures, the vector directions on the nonlinear results are all following the same direction, which is clearly not correct for my model.
Other than the strange vectors, the results of the linear and nonlinear studies are pretty much as expected.
I guess what I'm looking for is confirmation that this is a bug and not a misinterpretation or mistake on my part.
I'm using 2012 SP.5 Education version. I don't have access to the KB to check if this version has ever been linked to such problems.