Thumbnail problem with personal work on Substance Painter

Good Morning/Afternoon/Night.

I am actually searching for some solutions of why my thumbnail scuare only works on the Substance painter open sample but not on personal work. 

Image 1:

The thumbnail is a Sphere, the all day i saw i need to disable the "Simplified thumbnail" like you can see it's of and don't do the scuare thumbnail.

Image 2:

When i go to File > open Sample > and chose one of the 4 Substance painter projet. It works the thumbnail is scuare. [Image 3] The funy thing is when i do Edit > Project Configuration and change the Obj for the cube i take for example. It works the Thumbnail stay square!.

Image 4: 

 Actually i am using this settings for my projects and the image 4 is when i use the fill layer, still having the sphere thumbnail. 

I know the udims could maybe be the problem, but I test it on a cube whit only 1 udim and 1 matérial, and with an other object with 3 Udims 1 matérial and i can't solve this mystery.

Thanx for your time and i hope some one can help me please, because it's frustrating.

Anthony Chavez