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That’s weird, because Ep 2 has had tonemapping worked into it in every map.

In fact, what you describe sounds like a glitch actually.

Try verifying your Ep 2 files.

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.