SEO

In these days I have re-optimized the entire forum, with the modification of certain titles, I removed the display of the title of the forum by forum display, showthread and memberprofile, I closed some forum not relevant or that use of non-eligible securities with similar content , of 15 thousand URL's the sitemap that contained first, now it contained max 2800.

In 3 days have declined the PageRank from 4 to 3 (but no new URL's or title are indexed, strange!).

The fact is that if I go to see the URLs indexed by google webmaster tools, tells me that the sitemap system contains about 2800 URLs but 0 indexed, could depend on what?

If you use the site: command can you see any pages in the index? Are you still getting traffic from Google? Perhaps your site is banned?

Yes of course I get it, the site isn't banned, this happen perhaps I've modified some titles, or closed some forums, disabled showpost, resend sitemap, I really don't know, in the Google Engine I get once old URL's like member prifiles that I have disabled, Calendar URL's that I have disabled, and Old names that I have changed...