Version:            (using KDE 4.3.0)
OS:                Linux
Installed from:    Ubuntu Packages

It is not clear how to access your Remember the Milk account through the plasmoid settings window.  When I access the settings window and select the Authetication tab from the left-hand panel, I am presented with a place to enter my RTM account's username and password.  When I enter them and click the "OK" button, the widget displays the circular loading animation, but never progresses further.  If I return to the settings menu, the username/password fields are blank and the current status box still says that I'm not authenticated.  I could not find any documentation.  Maybe it's a problem with the builds I downloaded from the Ubuntu ppa.launchpad.net repositories, as I couldn't find anyone reporting similar problems after several Google searches.