I went from Megaton to Rivet City, and went totally east. Being wrong, I went west to the river, entering a few instances like a Hideout where a Wandering Ghoul sat, and moved on to Rivet.
Rivet Guards were quiet, not the usual welcome, and market/decks were deserted, save from a cop or two.
Back in Megaton, the people are still there but is some sort of freeze.

What could causer this, and is there a solution?

Thank you.

Hmmm...This is an odd glitch.

Are you on PC? Running any mods?

Try reloading a previous file and see if it fixes it.

No, restarted from scratch...
Hopefully it'll work now.
And yes, Night Vision mod.
Hopefully I can now end the game.

Thank you for the reply.