@mecho

Thanks again, mecho.

Concerning my .xsession-errors, 'types one and two':
I'm not having much luck deleting the .desktop entries. Anyway,
I'd like to understand this PolicyKit stuff a little better before
just deleting these entries. These came with the distro;
I didn't invent them (at least knowingly).

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Concerning my .xsession-errors, 'types three & four', Compiz 0.8.2-6
in Knoppix 6.2.1 does not look in the right places for theme material.
Clearlooks is part of gtk2-engines 1:2; Ubuntu Human would also be
available if gtk2-engines-ubuntulooks 0.9 were added to the basic
Knoppix 6.2.1.