Displacement of RectTool and FoV button disappear.

[kou-yeung]

In Unity 5.6.3f1 and Unity 2017.1.0f3. RectTool is Displacement from correct position and FoV button disappear.

I have identified this problem when used GUIClip.Pop() and GUIClip.Push(). but i not have idea how to fix it...