Hi,
I found that the problem (skin doesn't work) happens only with the
"Main" space, which is the main space ( :-) ), that is to say the space
containing the home page, the first page a user see after logging in. I
tried to rename that space using the Rename Space code snippet, but it
didn't work.
I remember you I have installed the latest stable version of XWiki
(1.2.2) and I am using the "finch" skin.
Thanks!