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users behind proxy server seeing mixed userids and inboxes
I've gotten a couple of reports from users on my site (running 2.0.18b2) that work in the same office that they've seen instances where their userid/posting identity will get "flipped" -- ie, UserA will hit my site to post, and will post as UserB.
UserB will be able to click on her inbox, and see messages/old whispers from UserA.
This hasn't been reported by any other users, so I strongly suspect it's related to their being behind a proxy server (of some type, they don't know what) in their office.
Any ideas what would cause this, or how to solve it?