I unzipped the Social II quickstart (jatc_social_ii_j3x.zip), set the file permissions, created a mysql db, and set up Joolma for the first time. All good.
After it installed, the site has an empty index.php (from the user side). I can go to administrator/ and sign in and the control panel is all there with articles, categories, templates, etc. I looked at index.php on the server side and it looks ok.
I did the same thing with the Intranet quickstart and it was working fine.
If I take the site offline then the "site is down for maintenance" message comes up.
Any ideas where to start looking?