When I migrated my site by cpanel restore function, the home page became blank. I use debug option, got message as fellow:

Notice: Only variables should be assigned by reference in file /modules/newbb/include/functions.ini.php line 74
Notice: Deprecated function 'mod_getunamefromids', use XoopsUserUtility directly. in file /Frameworks/art/functions.user.php line 26
Notice: Undefined index: OS in file /class/logger/render.php line 66
Notice: Use of undefined constant E_STRICT - assumed 'E_STRICT' in file /class/logger/render.php line 98

If you migrated your site, you have to adapt the path definitions in mainfile.php and probably also the database credentials.