The torsional sensitivity irregularity for rigid seismic design (NBC 2010 Table 4.1.8.6 Irregularity Type 7), was not being detected when it should have been. The program was mistakenly comparing the deflections due to positive and negative torsion for each outer edge shearline. It should have been comparing the deflections of the opposite outer edge shearlines, and is now doing so.

The incorrect calculations would rarely result in a torsional irregularity being detected.