Screen bug in v 0.6.0

Missing textures shows on the screen, but HUD is there.
How can i fix it? Are the models broken?

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.