I forget the technical details of this.  It has to do with your path structure.  Not having the pagename.xsp there.

There are ways to deal with this more from a coding perspective.....  But maybe the easiest way is to just avoid the url without the page name.

Create a new page called start.xsp or something.  Use that as your launch page.  In that page in something like beforePageLoad do a context.redirectToPage("home.xsp")....   something like that.

That should solve your problem.

Try having a look for relative URLs.  I am not sure off the top of my head, but you may need to use a slash in front of it or a dot and a slash or even double dot and a slash.  

stupid that the xpages editor does not fix the correct code.