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I'm having similar problems with a number of my sites.  Some established ones and a new one.  No new data.. my new site has been up for nearly two months, and I know that there are links... but nothing is showing. Very frustrating.  To be fair to the moz team, for my new site, I'm not seeing anything in WMT yet, even though I jumped through all of their hoops.

Hello Julian, If you follow my advice above you should be fine.

If you have good content on your site, there's a good chance that someone will add a link to your site from WIkipedia if it's appropriate for the topic. That happened to me and my site, and I can tell you that the links from Wikipedia helped: and I even see traffic from Wikipedia. I wouldn't be concerned whether or not the links are going to hurt your site: they will help establish trust. If your business is established enough and is a public company, for example, there's a good chance that you either have a Wikipedia page for your company or you should start creating one. You'll need plenty of neutral informational type of mentions (news articles, etc.) that establishes your business's credibility. One important thing to note here is that Wikipedia is a part of the Knowledge Graph, and it's important to get your site/business/link mentioned in the Knowledge Graph. Wikipedia is one way, but you can also participate in Freebase, which will help, as well.

You need to title the images what they are, not focused to SEO. So if the dress is called the Summer Green in Fields Dress, the file name should be summer-green-fields-dress.jpg (or something like it) and then the alt text be Summer Green in Fields Dress.

Julian, As TextureMediainc says keyword cannibalization occurs when you target the same keyword on multiple pages.  It may also occur when different keywords/key phrases are very similar or share the same words, "67 mustang" and  "67 ford mustang", for example or "pink wedding dresses" and "pink wedding dresses with straps" Keep in mind, too, that the On-page Grader report you are looking at is specific to the keyword you entered into the keyword field when you run the report If you change the keyword, you may get a different result.  For example, you may grade one of your category pages for the keyword "wedding dress" and find that it indicates you need to address cannibalization (and you get a grade of "A") but if you grade the same page for "pink wedding dress, you'll may find that it doesn't  (but that you grade of "F"). Be sure to look at your site's keywords hierarchically, with your most competitive keywords toward the top of the hierarchy (homepage); that each category of the site has a specific keyword reason for being it's own category; and that the keywords of category sub pages  fit logically and distinctly within the category.