Two serious probably-related problems importing from Bugzilla:
(1) All of the user accounts get created as "inactive". And I can't find a way to modify them en masse, so it looks like I have to edit all 30-odd of them one at a time to enable them.
(2) All of the imported bugs get assigned to the Adminstrator account, instead of to the actual current assignee. Although once I enabled one of the user accounts, I saw that all bugs imported after that got assigned to him.
I can deal with problem 1, it's just a few minutes of grunge, but problem 2 is a show-stopper since it loses a key piece of information about every bug.