Yet another issue about PDF image export problems, but this time I know what the problem is: For embedded images on pages, capitalization doesn't matter. Unable to render embedded object: File (foo.jpg) not found. and Unable to render embedded object: File (Foo.jpg) not found. will both show the same image, regardless of the actual attachment filename. However, if the capitalization in the wiki markup doesn't match the capitalization of the actual attachment, the image will be silently missing from the PDF export, even though it appears on the HTML page. This should be consistent. Right now, it's maddening when images just vanish.