[Darkness Falls: They mostly come out at night...]

16 minutes ago, cheml said:

if I look down or up, all objects become invisible, such as barrels, chairs, rubbish, cars, workbenches. is there any fix for this?

this does not happen everywhere, but for the merchant it happens at every step

 

Go back to menu, enter settings and disable Occlusion (culling). That will make performance worse, but that's the trade off.