Why doesn't the FedEx Tracking number data detector work in Mail anymore?

Hi there,

I'm running OS X 10.8.3 and Mail 6.3 (1503). I had an email come in that had a FedEx Tracking Number. The data detector picked it up and I was able to right-click and select "Track My Package". Unfortunately there was a "Communication Error" in the pop-up window so it failed. When I clicked 'Open in Safari" it worked! Is anyone else having this issue?