Steel sections were not being properly input into Sizer via the XML file transfer mechanism and did not design in silent mode.
See Also
Lateral Stability KL = 1 Setting (v8.31 - Bug 2105)
Project Settings Saved As Default (v8.31 - Bug 2255)
Design Search Failure Warning after XML Transfer (v8.3 - Change 124)
XML transfer of Version Info (v8.3 - Change 125)
XML Transfer of Combined Axial and Bending Results (v8.3 - Change 126)