The Maximum shear stress result shows the maximum shear stress (maximum normal stress) in the part element (warpage or stress analysis), or in the wire or paddle (Microchip Encapsulation analysis) at the selected layer through the cross-section.
Consider the areas with a high maximum shear stress value and compare the results against the relevant material criteria.
Note that the plot corresponds to one particular position through the cross-section, as specified by a normalized thickness value where -1 is the bottom of the element, 0 is the centerline through the element, and +1 is the top of the element. The normalized thickness value can be viewed or modified on the Animation tab of the Plot Properties dialog.