[SM-USERS] Strange problem with SM & multiple domains

[<geo...@al...>]

I use SM with multiple domains with the aid of VLogin (and multilogin). 
This has been very successful with arrays along the line of:

         'alphaworks' => array(
                 'domain'                => 'alphaworks.co.uk',
                 'imapServerAddress'     => 'localhost',
                 'imapPort'              => '143'
         )

in the $virtualDomains array defined in plugins/vlogin/data/config.php .

However, today the instance of SM on alphaworks.co.uk (as defined about) 
seems to have stopped working. The login page now has the URL 
https://mail.alphaworks.co.uk//src/login.php (note the double slashes) 
and the Compose: link has the URL 
https://src/compose.php?mailbox=INBOX&startMessage=1 (i.e. no domain!).

I've not changed anything at all in SM for some time and other instances 
of this install of SM on other domains are still functioning perfectly. 
Can anyone suggest what's gone wrong here, how it went wrong and how to 
fix it?

Thanks,
Geoff