Ubuntu One for Mac OS X proxy detection?

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http://askubuntu.com – Since new version of U1 (4.0), it's been claimed that it can read OS proxy settings. But in my case it didn't. I have my network settings set to "Auto Proxy Discovery". And browsers, mail and other apps are working fine. I had to configure proxy settings for Dropbox manually (it has such configuration). But how can I configure U1 proxy manually? If it for some reason ignores Auto Proxy Settings. (HowTos)