When using SolidWorks measure, faces filter is automatically selected.

When using SolidWorks measure, faces filter is automatically selected.

Sometimes, with MDTools loaded, the faces filter will be automatically selected and all other filter will be turned off when using the SOLIDWORKS measure tool.

If this happens, please ensure that both MDTools and SOLIDWORKS are updated to their latest service packs.
Ref: https://VESTusa.com/Manifold-Design_MDTools-900-Series_Service-Packs.htm.