My reference image won't show! So I've just started using Blender (2.74) and wanted to use a reference image.

So I made a reference image in Adobe Illustrator and saved it as JPG, then dragged into blender. It's not visible, even though I am in Orthographic Mode (Yes, I've tried googling it)

I have also gone to "properties" and enabled background image, and I have tried changing the axis of the image and then changed the camera to the axis. I could of course make a plane and place the image there, but it would be anoying every time I go into wireframe mode.

It's extremely frustrating! Can anyone help me out? Thanks for reading.

Screenshot:
Reference images are visible when you are in orthographic top, down, back, front, right or left view. The shortkeys are, respectively: Numpad 7, CtrlNumpad 7, Numpad 1, CtrlNumpad 1, Numpad 3 or CtrlNumpad 3. And also in camera view Numpad 0, with thanks to cegaton :)