Having this Bug in 5.4.1f1 x64

This bug has shown up again in 5.4.0f3!

When your canvas changed sizes,positions,scales... from this issue.
You have to recover that settings by codes.

Like this .

rt.transform.localPosition = new Vector3(0,100,0) ; // position recover
rt.sizeDelta = new Vector2(1000,1000) ; // size recover

How many canvas in our project....

I found workaround code this issue in my project.
But I think this is not right answer for our problem and layout seems broken on Unity Editor yet.

Attach to this code included script(C#) for layout broken canvas with this issue.
// =================================
using UnityEngine;
using System.Collections;

public class CanvasIssueWorkaround : MonoBehaviour {

// Use this for initialization
void Start () {
#if UNITY_5_2
RectTransform rt = gameObject.GetComponent<RectTransform>();
rt.transform.localPosition = new Vector3(0,0,0);
#endif
}

// Update is called once per frame
void Update () {

}
}
// =================================

I hope Unity team help us ASAP.
Because my client said "You have to use Unity 5.2.x. and scene crush problem is your miss! Absolutely, you commanded display and inspector crush in some way!!!!"

This issue is not appear for my project historical(4.6->5.1.x).
Please,help...

Sorry bad english from Japan.

I'm also getting this in 5.2.0f3.

Strange, but in 5.2.1f1 Personal I've got this issue on my desktop computer, while on laptop all is OK...

This bug exists in 5.2.1f1

It seems to me that a canvas anywhere in the hierarchy will be reset to anchor in the lower left regardless of where it is set in the inspector. The scaling will also change. When entering playmode, all the canvases are scaled to fit the game window, so positioning my UI elements on a panel nested under the nested canvas (rather than simply positioning them directly on the nested canvas) fixed this issue for me. (Disclaimer: I am quite new to Unity and I may or may not understand exactly what the issue here is. Hopefully this is helpful to someone.)

Using empty Game Objects into the hierarchy has not fixed this issue for my project.

Has not been fixed as of 5.2.1f1