Black Textures after Update

The map has many shadows / shading issues. Many times I walk from a lighted area into a black hole. Walking and running into a poor shaded area that turns into a hill / tall rock and Im unable to move forward until I figure out how to get around or over it. Stairs and other models disappear, when being approached. Tough to move around when you can't see and stairs vanish due to shading / shadows. Lets use the previous version of lighting.