Missing Artifact Weapon

I'm playing a Vengeance Demon Hunter on Beta03 named Jyll. I completed the questline at 102 for my Havoc artifact (Twinblades of the Deceiver) successfully. I carried them around happily for several levels and have dual spec. There have of course been some disconnects and rollbacks, but at some point around level 105 the Twinblades disappeared from my inventory and there is no way for me to recover them. I know I didn't accidentally sell them (you can't) and I definitely didn't delete them. They're not in my bank. They're just gone. As a result I can ONLY play Vengeance, which can make instances, grouping, and raid testing a bit difficult. I guess I could re-create and re-level a new Demon Hunter, but if this happens to the Demon Hunter I create and spend time working on pre-Legion, it's going to be a big problem.