To fix your problem it is very simple, do not use HarryBO210-1-2 perks ever. Instead, you can use Gympie's cool perks(your favourite scripter). You can make a new empty map, and copy your current map there, cos it will be clean and ready to use with no bugs and such, and then follow Gympie's...

Assuming that you're talking about the buildable icon for the power switch, can't you just make one by yourself? Use paint.net d00d, it literally takes 2min to make it.
Or ask Gympie, he can give you one of his favourite shaders cos he likes a lot collecting shaders of different buildab...

Don't listen to him man, he hasn't been feeling good lately

Jokes on you!

 What is?

Yes they can be changed, i haven't looked at the mystery box's laughter sound but i know how to change the announcer voices. 

1. Take the _zombiemode_a...

No i don't like the gravity shown in your screenshot. I am not impressed btw!