I tried to turn on recommendations for Ubuntu Software Center. It asked me for a username and password, so I tried entering what I thought was my Ubuntu One login. Now it seems to silently fail getting recommendations and it no longer asks me for Software Center credentials.
When I run USC from the terminal, I see this message:
2012-05-27 16:16:42,919 - softwarecenter.backend.spawn_helper - WARNING - got error from helper: 'WARNING:__main__:401: {'status': '401', 'content-length': '22', 'via': '1.1 sumac.canonical.com:3128 (squid/2.7.STABLE7)', 'x-cache': 'MISS from sumac.canonical.com', 'x-cache-lookup': 'MISS from sumac.canonical.com:3128', 'expires': 'Sun, 27 May 2012 23:16:39 GMT', 'vary': 'Authorization,Accept-Encoding', '-content-encoding': 'gzip', 'server': 'Apache/2.2.14 (Ubuntu)', 'last-modified': 'Sun, 27 May 2012 23:16:39 GMT', 'etag': '"7e287fc885d9fdcf42da3a12f38572c1"', 'strict-transport-security': 'max-age=2592000', 'cache-control': 'max-age=0', 'date': 'Sun, 27 May 2012 23:16:39 GMT', 'content-type': 'text/html; charset=utf-8', 'www-authenticate': 'OAuth realm="SoftwareCenter Agent"'}'
401 is "Unauthorized", so I'm pretty sure there's a problem with the login information I supplied (and I'd say there's some room for improvement in the interface).
Is there any way to reset it to ask me for login information again?