Test to see whether image resolution is a factor in VE editing edit
When a section containing a picture is opened for editing in Visual Editor, any images in the section are wrapped in a special frame that prevents them from being deleted. However, the frame and the picture inside it are not the same size as the picture displayed in the "read" view of the section. See this discussion for details.
Open this section for visual editing edit
Here are eight images for testing possible factors. Each one is formatted as a thumbnail. If you attempt to edit the section with VE, you'll see how each thumbnail changes size.
The variations are 300x200 and 300x600 at 300dpi; 300x300 at 300dpi, 120dpi, 96dpi, and 72dpi, 3000x3000 and 300x300 at 298dpi.
