Options - shift + left click
Have you ever loaded Raster design only to discover your shift+left click no longer works? If so, you can change that by going to the Raster Design Options box. The Mouse Settings in the User Preferences tab will take care of it. The advantage to having that little box checked is that you can select an image from inside the image frame, without zooming out, so it's a trade-off. I hope Autodesk will make a keyboard shortcut to make it easier to toggle this setting on & off since I change that setting frequently for different projects. If it happens, I'll post an update.