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 Valveā€™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.