[xwiki-users] Skin problem

Hi, my name is Diego and I am a (young) XWiki administrator. Upgrading from version 0.9.840 to the latest stable version (1.2.2) and using the Import/Export method to fill data in the new wiki, I observed this problem: if a page is not under the space "XWiki" ( i.e., the page's URL is not like ".../XWiki/.../page" ) , the skin is not applied correctly to the page (it's not applied at all!). We have a lot of data in the wiki, so could you suggest me please an efficient way to fix this problem? Maybe there's something wrong I did during the import/export process? Thanks.