After you enable Aliasing, any relative links embedded in your Web pages that are not preceded by a slash (/) may demonstrate symptoms such as:
Runtime error notifications
Broken images (you see a red X where the image should be)
Missing text styling
The following Ektron CMS400.NET Knowledge Base article analyzes this problem and presents solutions: http://dev.ektron.com/kb_article.aspx?id=19254.