Google said they have made the rich snippets testing tool error reporting more robust. Many webmasters can't figure out why Google isn't showing rich snippets on for their sites. Sometimes their is a coding error which is hard to test since the tool was limited and sometimes Google simply doesn't want to show it. If it is the coding error, then Google wants you to fix it and has "added new error messages to the rich snippets testing tool to help you better identify and fix any problems with the markup." Give it a try.
Some people like the breadcrumb URLs in Google and some don't. If you do and want to encourage Google to show breadcrumbs you can use the new rich snippets breadcrumbs feature. For more information on how to use it, click here.
Forum discussion at WebmasterWorld.