A couple of questions after migrating xwiki from 0.9.840 to 1b3

Hi, I have migrated xwiki from 0.9.840 to the latest 1.0 b3 (from subvesion). My content can now display successfully in the new version. I also imported the .xar so I have all the additional spaces/pages created. I can log in via my old userids(including Admin) and the newly created userids. But I have the following issues that I cannot solve: 1. I cannot see XWiki as a space in my spacelist. I can see all other spaces and the space I created after the migration. I tried Admin and superadmin so this shouldn't be a security issue. 2. My previous pages are categorized in 0.9.840 in 15 categories. I could navigate to the pages from the category list. Now all my pages are displayed in the Main space without categorization. Is there a way to get back the categorization for each pages? I noticed there are a couple of predefined categories in the Blog space. 3. Now in 1b3, we can tag a space or page, but how can we leverage this tagging? Is there any snippet that display pages clustered by tags (e.g. something similar to del.icio.us or something else? 4. We can define skins in xwiki.cfg and also in the Global/Space Preferences section. Will the skins defined in the Global/Space Preferences section always take precedence over the one defined in xwiki.cfg? If I create a new skin folder called "xwikitest" with the basic .vm files, should I reference it in the Global/Space Preferences as xwikitest or XWiki.xwikitest? Thanks -Jimmy