collective.xdv does not style a virtual host subpath

[Jim Leek]

I have collective.xdv installed in Plone 3.3.5:

     * Plone 3.3.5
     * CMF 2.1.2
     * Zope (unreleased version, python 2.4.5, linux2)
     * Python 2.4.5 (#1, May 26 2009, 16:04:26) [GCC 4.1.2 20080704 (Red Hat 4.1.2-44)]
     * PIL 1.1.6

 I am using Apache (for testing it is running on port 2010 to bypass firewall restrictions) in front of Varnish (port 9000) and then Plone, and am using mod proxy to map my virtual host:

     <Location /xdv-test>
       ProxyPass http://163.1.223.63:9000/VirtualHostBase/http/webstar.eng.ox.ac.uk:2010/xdv-test/VirtualHostRoot/_vh_xdv-test
       ProxyPassReverse http://163.1.223.63:9000/VirtualHostBase/http/webstar.eng.ox.ac.uk:2010/xdv-test/VirtualHostRoot/_vh_xdv-test

 In "XDV theme settings" (within Site Setup) I have added the following to the Domains to be styled:

 webstar.eng.ox.ac.uk:2010/xdv-test

 Everything seems to be working except for the "home" link on my breadcrumb trail.

 If I view http://webstar.eng.ox.ac.uk:2010/xdv-test/ then my site is themed as intended.

 However, if i remove the trailing slash (http://webstar.eng.ox.ac.uk:2010/xdv-test) the site is un-themed.