Hey, I just had a problem with Blender. I must have pushed the wrong button cause my background image can be only shown in camera-view (in one of my projects). How can I put my background image back to front or side view?
You need to be in an orthographic view (View/Orthographic or NUMPAD-5), and the view must be set to a “non user” view (i.e. Front,Top Side)
This is probably one of the most frequently asked questions, and I’m bored and decided to answer, but if you search the forums you’ll find over 80 threads with background image in the title 
Mike
tnx for having so much patience then 
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