Some users have reported an issue with no npcs or vehicles spawning in the latest version of Sandbox+. I’m looking into why it’s happening, but in the meantime you can simply delete default_districts.xtbl and default_global.xtbl that were included with the mod, and it should correct the issue. Be warned that doing this temp fix will also break the alternate times of day shortcut (F+HOME), so only delete the files if you’re actually experiencing the issue.