Logo changed automatically?

I joined this stupid server with a hoverboard addon. And now all my loading screens are like this:

Anyone know how to delete this? I would like hoverboard server to be punshed for doing this.

lol, that looks cool.
the matrial is replaced , you can either keep it that way , ask a freind to giv you the real one , or reinstall gmod.

Or just delete the material in question… which will make it revert back to default.

Restart and boom!

It’s back to normal.