Top Navigation bar highlight problem - Resolutions

SharePoint 2007 fails to highlight correct top navigation tab in some cases.

Check for the following causes:

1. Highlight will work ONLY for content pages (not for AllItems.aspx or for /documents)
2. Highlight will work ONLY for relative URL's (Not for http://sites/pages/abc.aspx, But will work for /pages/abc.aspx)
3. Will work if NO duplicates in the current navigation set (i,e. Every menu item should point a unique url)
4. Only for the pages coming for "Pages" directory / Root of the Web

5. Show pages  should be checked under : Site Settings > Modify Navigation