Jeff, Not sure when it started but my combined map view is blank. I am also seeing a lot of these errors in my log. It will generate one of these errors whenever I select the Combined map.
Sep-22 3:56:55 PM weatherXML Error webCombine: The path is not of a legal form.
Sep-22 3:47:53 PM weatherXML Error webCombine: The path is not of a legal form.

UPDATE: Combined map working again, and no more of these errors.