Help with duplicate issue

Hello there.... in my photography blog I just changed my permalink in WP to a more structured solution that better cover and describe the variety of pictures and images displayed.

So i moved from...

http://mysite.net/blog/yangon-photos/

to...

http://mysite.net/blog/photography/sout ... on-photos/


I use Platinum SEO pack plugin in WP and I have everything re-directly 301 smoothly to the new url.

If I digit the old url in the browser I got the new one and the correct page.

Also the canonical link is created correctly and is the new one.

All look perfect but... Google webmaster tool is finding out hundreds of duplicate content considering wrongly the old url and the new url as different pages (and so obviously same title and description).

What I should do?

How long ago did you change your URL structure? Sometimes it takes a little while before Google has everything updated. It sounds like you did everything correctly if you 301'd your old urls to the new URLs and even put canonical link tags in which would only further clarify things.

Has your traffic changed at all?

Is just 15 days... and noted the duplication issue come up after 1 week.

Yeah I would give it a bit more time than 15 days. I would bet it will take at least 3-4 weeks before the Google Webmaster data catches up with all of your changes. Usually the Google Webmaster area lags a bit as far as what is currently going on.

Ok.... let's see and hope

I agree. I did something similar to this and it took longer than 15 days to get recognized by google webmaster.

Ok guys can confirm.... today there are no errors anymore.

Regarding this issue and experiment I just want let you know that today there is not anymore any issue with duplicate content in my website but the pagerank of all the changed url post in WP is now 0 (before was 2) like if it was a brand new page with new url.
That was really bad! and Google states exactly the opposite saying that a correct 301 redirection does not alter the old pagerank.