Changes made when editing the Product Family Grid (such as the adding of sort options to field) may not be applied when the grid is saved.
ProductFamilyGrid can be edited under My Profile -> Administration -> Customisation -> Product Families -> Lists. On saving changes to the grid, these changes may not be updated.
The metadata for the grid is not reloaded automatically.
The changes can be applied by carrying out a manual metadata refresh.
This issue is resolved in v7.3. From that version on, changes to the Product Family Grid's properties will result in its metadata being reloaded.