Using Wordpress 3.5.2 and Atahualpa 3.7.12, with plugins including Post-Page Associator.

When I load a long, narrow picture of a person (full body) in a post, the excerpt of the post generated by Post-Page Associator shows a thumbnail with the person's head cut off.

In trying to fix this, I went to Media Library, and tried to Edit and Crop just the thumbnail of the original photo. However, after Cropping, when I click "Save" below the cropping screen, nothing happens. When I clicked "Update" (in the right column on the edit photo page), it appears to Save, but no change is made to the thumbnail, and the problem persists.

I want the full post to show the full-length image of the person (so am not selecting Thumbnail size when uploading the image to the post). But, I want the thumbnail in the excerpt of the post generated on a page of the site by Post-Page Associator to be cropped so that it will show the head of the person.

How to fix this?

Many thanks in advance for any help.

what happens if you use twenty-twelve?
i.e. is it a theme, plugin or wordpress issue?

Thank you, Juggledad. It turned out to be a plugin problem. Plugin appears to crop its own thumbnail, and requires fresh upload of photo from computer to generate a thumbnail. Does not recognize Media Gallery settings, as it cannot generate a thumbnail upon upload from the Media Gallery.

So therefore, I found a (somewhat clumsy) work-around. Upload a perfectly cropped thumbnail somewhere within the post directly from my computer -- which generates the thumbnail I want in the excerpt. Then place the full photo into the post from the Media Gallery - which the plugin does not recognize - so no distorted thumbnail generated.