bad inline model number 74

I’got an error “bad inline model number 74” after recent update.
I’m very sorry, but…

Same happened to me. I’m wondering what caused it but I was able to solve it by restarting the chapter from the New Game submenu.
More info: it happened to me at the end of Unforseen Consequences at the headcrab lift. Reloading any checkpoint from before (in the same chapter) didn’t seem to solve the issue.

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.