I am having the same issue exclusively with my Warlock. Did anyone do the refer-a-friend quest also? I did with this character and I accidently deleted my legendary sword. I got a new one from Shax and then shortly after the postmaster bug occurred. Not sure if it is related but thought I would mention it.
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From what I'm seeing a lot of people are getting this bug from different things, and times. I haven't done the refer a friend quest yet so that may mean it's not directly connected.