Try this on the additional web server:
Open the Custom Property Editor tool
Right click on a blank grey area of the Toolbar, and go to ‘Customize..’
Click the Commands tab
Under the “Commands” section, scroll down and find the “Update Report Schemas” button. Drag this to your Toolbar and click on it.
That did it. I've had to do that in the past for Report Writer, but wasn't aware of that option in the Custom Propery editor.