Issue with FEA mm units and OpenVSP stability

[Rahul R]

Hello All,

I am facing a weird issue with structures module of OpenVSP. I have generated a simple wing geometry in meters and have input custom materials in the material panel of FEA structure (based on the OpenVSP 2025 structures demo). When the structure units is selected as SI, I do not face any issue. However, whenever I switch the units to MPA, most of the functionalities of the FEA structure panel cease to work. I get ineligible values in the drop downs. 

I am attaching a screenshot of the dropdown and the .vsp3 file with MPA units. I am facing same issue in both OpenVSP v3.44.5-win64 and OpenVSP-3.46.0-win64-Python3.11.

Regards,
Rahul