I just checked my tracking number and now it's saying they are unable to retrieve my tracking information at this time.
Also that I do not currently have any shipments. That's weird. It's not like it vanished.
I had the same thing happen with Fed Ex this morning and then around lunch time it was back and 15 minutes later my package arrived. I think is most likely things are really screwed up with the tracking systems at this time, at least I hope so for your sake. Good luck.