I thought this was a weird error. When I use the "Secure Login" extension (think Opera’s "Wand" --- it’s the same thing, just it’s for FF2) on the Manager Login page, instead of doing the normal "type username, pass shows up" (what FF normally does), it gives a pop-up window w/out any text, and then when I click OK, it’ll refresh the page, and say it had a bad user/pass combination.
Works fine when I do the normal FF2 way of auto filling a field by typing it out, though.
