Today I just made one of my wordpress site to multiuser , I follow some instruction on internet , so far I think there’s no problem with server configuration , domain and virtualhost. When I add new site, I found it was okay but when I access it it just blank , view source page with no result.

After figure it out, I found that A new site will use “twentyeleven” theme as it default theme , unfortunately I have delete “twentyeleven” theme from my wordpress site :p , so that’s the problem why I got blank site , I point the new site to a new theme available, and everything just work great