This is really weird but it happened on both my computer and my iphone, using firefox and safari respectively if that's any help
Using advanced forum search for the word "resolution" in the Title box brought up a username/password pop up that said:
A username and password are being requested by youarebeingmanipulated dot com. The site says: "Access Restricted (pwrestrict)"
That it also happened on my brand new phone makes me think it's not on my end... I hope?
edit: rephrased to not be a link