This happened to me on my 17-55 on a 40D. I was getting vignetting at 17mm (only slight). I didn't put the hood on properly (not locked down properly).
Took me about 15 seconds to work it out though. 
StealthyNinja Cream of the Crop 14,387 posts Likes: 4 Joined Nov 2007 Location: Mythical Tasmania (the one with lots of tall buildings in the semi-tropics, A.K.A. Hong Kong) More info | Jul 28, 2008 06:40 | #61  Permanent banThis happened to me on my 17-55 on a 40D. I was getting vignetting at 17mm (only slight). I didn't put the hood on properly (not locked down properly).
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