Http://us.burberry.com/: Big traffic change for top URL (error 593f1ceb2d67)

[FashionLux]

Please forgive duplicating this question on the SEOMoz & Webmaster Tools forum but I'm hoping to hit both audiences with this question...

A few days ago I noticed that our US homepage (us.burberry.com) had dropped from PR5 to PR0, and the page has been deindexed by Google. After checking Webmaster Tools I also received the following message:

http://us.burberry.com/: Big traffic change for top URL      April 2, 2012Search results clicks for http://us.burberry.com/ have decreased significantly.Message ID: 593f1ceb2d67.We're not doing any link building at all (we've enough on-site issues to deal with). The only changes I have made are adding Google Analytics to the website, uploading sitemaps via Webmaster Tools (it's not linked to from robots.txt yet), and setting the burberry.com and www.burberry.com geo-location settings to 'unlisted' (we want uk.burberry.com appearing in the UK results, us.burberry.com appearing in the US results etc rather than www.burberry.com).I've reversed the geo-location settings but I doubt this would have caused this. We've duplicate copies of our homepage (such as us.burberry.com/store//) from typos in inbound links (and bad programming that allows them to work rather than 404'ing) but I don't think any of this is new. What I don't understand is (a) why this is happening now and (b) why is this just affecting our US homepage? We've ~40 different duplicates of the homepage (us, uk, ca, pt, ro, sk etc etc) so why is the US site being affected and not the others? Does anyone know if this is due to an algorithm change by Google or something else all together? Background:Our website www.burberry.com has 46 subdomains such as uk.burberry.com, ca.burberry.com and us.burberry.com. There is a lot of duplicate content on each subdomain (including basic things like tracking parameters in URLs) and across subdomains (uk.burberry.com/store & us.burberry.com/store are exactly the same), there's very little text on the site (its nearly all images), as well as poor redirects, inaccessible content (AJAX/Flash) and a whole host of basic SEO things that aren't being done correctly. I've joined the company in the last few months and have started addressing these issues but I've got a LOT of work to do yet.One thing that we have in our favour is a link profile that is as clean and natural as they come - there was only ever one link building campaign performed (which was before my time) and I had all of those links removed as soon as I joined the company.Any help would be greatly appreciated! Thanks for your timeDean RoweEdit: us.burberry.com 301 redirects to us.burberry.com/store/ as explained on the webmaster tools forum, but I don't believe this is the cause as its the same across all subdomains.

[FashionLux]

solved via GWT thread: https://groups.google.com/a/googleproductforums.com/forum/#!topic/webmasters/WlUzNLFQB54/discussion