We have the same problem after upgrading to 10.5. Since the Custom Property Editor is replaced we also had to run the Configuration Wizard to solve it.
Since this causes downtime for us; Please - bring back our "Update Report Schemas"
To update report schemas for custom properties:
1. Ensure that Report Writer is closed, and then click Start > All Programs > SolarWinds Orion > Grouping and Access Control > Custom Property Editor.
2. Right-click on the toolbar, and then click Customize
3. Click the Commands tab, and then click Properties in the category list.
4. Drag Update Report Schemas to the toolbar to add a new button to the toolbar.
5. Close the Customize window.
6. Click Update Report Schemas on the toolbar.
7. Click OK after the custom properties have been added to the report schemas.
8. Close the Custom Property Editor.