Command to recreate all signals:
/c for _, surf in pairs(game.surfaces) do
for _, sig in pairs(surf.find_entities_filtered{name = {"rail-signal", "rail-chain-signal"}}) do
local arg = {name = sig.name, position = sig.position, direction = sig.direction}
sig.destroy()
surf.create_entity(arg ...

I do not have any mods installed, I was just starting up the game through stream. I had what seemed like two windows open listing the game as well as an error window. I had to close both games (the games did not load, it was just a black screen) to get to the error page.a

I hope the above is ...