I am attempting to update thumbnails for a folder of MXD but the thumbnails generated in python are all blurry. If I create the thumbnail using the map properties dialog inside arcmap the thumbnail is fine. As an aside, the "make thumbnail" button is disabled in ArcCatalog. Not sure if that is a bug or an issue with our install of 10.3 but it's the same on all our installs of 10.3.
Any ideas why the makeThumbnail method isn't producing high quality images?