How do I - disable all hints/turn on lights with a switch?

[Kreekakon]

No it's not normal, at least not for the effect you're intending.

Here's the problem:

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SetEntityPlayerInteractCallback("lever_nice01_1", "LightsFunction", false);

You're using SetEntityPlayerInteractCallback which means it will trigger instantly whenever the player interacts with it, for example simply touching it.

Use this instead:

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SetEntityConnectionStateChangeCallback("lever_nice01_1", "LightsFunction");

Take a look here for a tutorial on a similar matter: http://wiki.frictionalgames.com/hpl2/tut...cretshelfs