Can you tell me if you can define slave site.
The only reason that I see is that the files is not saved on the disk (but I don't know why)
To perform a real diagnosis I should have to debug on your website
Check at least that the files /multisites/config_templates.php is created and contain the infos that you have entered.
If you want that I investigate on your server then you can order my billable support on
www.jms2win.com/download?page=shop.produ...35&category_id=1
Your problem could also be due to a permission problem.