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I made some changes to the field names in the registration/edit form to avoid it being overwritten by browsers such as Mozilla, which can remember form data on a site and automatically insert it when a form with those fields exist in the page.
E.g. in 2.0.6, when I edited another user, my username and password would be inserted in the form and I had to manually modify/delete it to resemble the actual user, being edited.
I am 99% certain (1% uncertain due to you experiencing this now) that I had corrected the field check to resemble the new field names, but will look into whether it is actually so.
Sorry for the inconvenience