I'm drawing a gui using OnGUI, and have a keyboard shortcut for showing/hiding it. Toggling visibility causes some weirdness on 3d text-meshes using the standard GUI/Text Shader. Rendering of them changes, sometimes to a dark color, sometimes they disappear. It happens consistently in builds when toggling the GUI on/off, never in the editor:

Has anybody encountered this?

I'm toggling by setting a bool in Update:

void Update() {
  if(Input.GetKeyDown(KeyCode.F1)) {
    showGui = !showGui;
  }
}

And drawing gui based on that bool:

void OnGUI() {
 if(showGui && allowGui) {
    GUI.skin = guiSkin;

    /* gui drawing code */
  }
}