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Hey there. Been following this thread. This issue is currently blocking us from updating to 5.2. Unfortunately our situation with nested canvases...
Yeah. I've noticed some crazy weirdness over here too when image objects have a negative width or height value. Lots of weird artifacts.
Taken from a separate post: http://forum.unity3d.com/threads/finding-the-size-of-a-content-size-fitter.312008/