Results using version 6.21.01.09 differ from prior versions.
This release installed a faulty version of the Mstload6.exe file used in calculating loads. The corrected file is installed with release 6.20.01.10 or 6.20.01.11.
Update to the latest build.
Note, another build 6.20.01.12 was briefly available where a similar problem with Mstload6.exe occurred. That version was removed from our download site, but if you have a copy of that build installed you should remove it and restore build 6.20.01.11.
MStower Wind Loads on Lattice towers