UV Unwrapping Distortion

I want to unwrap (only) the cover and back of my book. I have marked only the cover (white lines) but when I unwrap using (unwrap > conformal) it is totally distorted. (see image).

I have done this successfully before in other Blender versions but I am unsure why it is not working now in Blender 2.62. Any ideas?

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Without seeing the .blend it’s difficult to say.
But assuming you have placed your seams on your model correctly, and the result is always distorted, try to select all then U -> Project From View to reset whatever data could be in memory.

Then re-unwrap as usuall U -> Unwrap.

You probably just missed a connecting part so that it can release itself completely. I do that all the time. Also, make sure your normals are correct, remove doubles, and apply scale. Those things take care of most problems for me at least.