i am using the lightroom plugin version 1.5 pro and i am also having the same issue. my web hosting company (strato.de) has a unified FTP login server address for all users. once logged in with your credentials, the domain is then set "automatically" to the main domain in the package but does not correspond to what i intend to use. this makes open in new window display an 'error'.
the other issue is that because of this, the new "download" feature does not work, as it tries to download with a wrong path. i really intend to use this feature on all my clients galleries, so a fix is needed.
please can you provide an option to set the link URL base directly in the lightroom plugin? this would be much better than having to mass edit manually the xml files on the server...
markus gröteke / 3dworks photography