I’d recommend you put the navy background on something that surrounds both the media credit and the caption to ensure that there are no gray bars in between. If you can’t find anything to target with your CSS, you can surround the images yourself by filtering the_content in your functions.php file, though beware of any performance degradation.

while the one without media-credit looks like this:
<div id="attachment_2463" class="wp-caption alignleft" style="width: 210px"><a href="http://www.whetstone.wesley.edu/2011/10/24/wesley-football-team-crushes-frostburg-state-at-homecoming/img_4756-2/&quot; rel="attachment wp-att-2463"><img class="size-medium wp-image-2463" title="IMG_4756" src="http://www.whetstone.wesley.edu/wp-content/uploads/2011/10/IMG_47561-200×300.jpg&quot; alt="" width="200" height="300" /></a><p class="wp-caption-text">The Whetstone/ Cochise Lucas</p></div>

I’ll try changing the values for the alignright class, but I’m afraid that will affect too many other places on the site. If that doesn’t work, is the solution then to find the caption processing in WordPress and add a third class, after alignright, to override that top margin?

You’ll want to do this in your theme’s CSS file rather than modifying the plugin directly. You should be able to target the images, captions, and media credit sections using the CSS classes you see above, among other tags. Just so you know, the code you posted is part of the caption, not the Media Credit, and the styling for it is coming from line 174 in custom.css in your newsport theme. Media Credit uses divs and spans only.

Also, in your custom.css file, you specify a bunch of MC-specific styles. However, the targeting is incorrect for many of theme: .wp-caption-dt should be .wp-caption dt and so on.

When modifying the caption styles, you might want to consider only modifying them if they immediately follow an MC div using adjacent sibling selectors, such as .media-credit-container + .wp-caption.

I need to change:
<dl id="attachment_2469" class="wp-caption alignright" style="width: 310px;">
to
<dl id="attachment_2469" class="wp-caption alignright" style="width: 310px; margin-top:0px;">
but I can’t find where to do that. Help?

Interestingly, the author field in the media library listing reflects the value of the credit field correctly so I suspect that the value of $post refers to the post as opposed to the attachment. I don’t know enough PHP to figure it out, but I would love to get this working correctly.

Any thoughts?

That said, I also wanted to ask if it is possible to further integrate Media Credit into the TinyMCE image capabilities in WordPress. When one wants to edit an image in a post (say, for size and external linking), Media Credit is conspicuously missing from among the options of editing the attributes of images (but not from when one wants to upload an image or go into the gallery of already uploaded images). Also, I wonder if NextGEN Gallery’s makers could benefit from your contribution.

Once again, I love this plugin, and wish I had come across it sooner! Thank you!

I’m sorry to hear about your troubles with the plugin. What version of WP are you using? Does the issue happen every time you try to give credit to users? Does it only happen for users of your blog, or only for “freeform” credits, or does it happen for any and all credit you try to attribute?

-Scott