A few days ago I changed Teams both thrue BOINCstats and through indevidual project sites accept two that are Unreachable/Offline. How can I change my Team in my detailed statistics page. This still shows my old team containing the two unreachable projects. This is also reflected in my signature as despite running all projects on two machines for two days now the CPIDs will not change.

Actually, there are now two of you. One part of BOINC@AUSTRALIA and one part of Cruncher Junkies.

I'd say this page is your 'new' page and the sig box is:
http://www.boincstats.com/signature/user_1753565.gif