I did.
I haven't logged int uservoice in a few months. So I was half guessing at my e-mail address and username.
Normally, when I don't remember, the error prompts on the log in page will indicate if I'm trying the wrong creds. Then I can try another set of creds.
But on this form, instead of telling me my creds didn't match anyone, it registered a new account with the e-mail address and username I entered and auto-sent me an e-mail welcoming me to uservoice. Ugh.
I tried it again with a different e-mail address, this time it matched the e-mail address against one in its DB and changed the username field into a password field before I could enter something into the username field. I took this change as an indicate that I'd found the proper e-mail address, entered in my password and was logged in. The whole experience was confusing and annoying though, almost as bad as the whole OpenID click-hear-go-to-another-site-read-some-legal-stuff-click-there-go-back-to-original site UX disaster.