IanCP - 3:50 am on Sep 21, 2012 (gmt 0)
You should register both www and non-www in WMT
The proper one has been there quite a long time. The non-www one Google did that all by themselves quite some time ago, hence the problem. I didn't put it into WMT. Strange.
Simply put: http://example.com/ is non-existent, so they can't crawl what doesn't exist.