I just noticed that a major change is that the url of the post changed shape: while the main website url have this form
http://www.site.com/blog/2013/02/14/4684/
Subdirectories posts have urls like this:
http://www.site.com/subdirectory/2012/04/30/post1/
But I must declare my ignorance in this situation… How can I solve this contradiction?
