Steps to reproduce:

!) open your task manager and be prepared to end the task
1) open the project
2) open scene 'Scene'
3) Select 'Image' (child of Canvas)
4) Choose one of the two methods below(possibly caused by rect transform):

1. Add an Image component to the 'Image' GameObject (Instantly go into task manager so you could terminate the task before its too late)

2.1 Copy the Rect Transform component
2.2 Create empty GameObject and Child to Canvas
2.3 Paste Rect Transform values to the new empty GameObject

Doesn't reproduce with: 5.1.3p3