Uservoice is just very finicky about my passwords and such. I logged in with Gmail afterward and that worked, then I tried to link it to my account using a l/p that I know is good, and so it apparently accepted it and forwarded me to problems.startupweekend.com where it suggested I log in. I had a lot of fun doing that dance, and hope to never do it again.

Known bug related to domain aliasing (session cookie set on one domain and not the other). Sorry about that, we're working to get that fixed.