Have you tried checking you robot.txt file and the sitemap.xml file ?? If everything is in the correct place then try requesting the bing crawlers to crwal your page again but heading over to the bing webmaster tool and submit you site over there. See if that fixes your issue or not !
Although link assistant's powersuite is a bit advanced and you need to install it, it's free version does give you access to about 4 different tools which can really help to identify issues on your website.