jemois - 11:21 am on May 12, 2012 (gmt 0)

There could be many reasons for this. How old is your site ? Have you been penalized/filtered by any reason ? Are the subdomains new with new data or redirected from old url's by moving the old data through 301 ? where do you see the frequency of the Google Bot crawl ? check with the site: command if the new/modified pages are already cached and indexed. The best way to see if the new version is indexed is by checking the preview of the page in google search. Providing more information will help us getting a better image of what's going on. I also modified one of my sites about 2 weeks ago. Google WMT tools shows almost no crawling of my website, but the whole design was changed. I noticed that actually all of the pages are indexed in the new version but are not yet ranking for the new content.