I've created simple course content using the page resource. If the page is text only it works perfectly. The content is downloaded, renders correctly, and is held in cache.
If I add a picture anywhere in the page it seems to confuse the mobile app and it only displays (and caches) the image and none of the text is displayed. No amount of refreshing will make it go away. Even if I delete the image in the course page I cannot cause the mobile app to lose the image.