No preview available after slicing

[hannibal 1]

Hi,

 

On Cura 5.2.1, after slicing my model (a lithophane box) there is no preview available in the "preview" tab.

If I try with a very simple model, after slicing cura is stuck at 99% on "Processing layers".

 

Do you know what can produce this error ?

Thanks in advance for your help

 

 

[hannibal 1]

Finally found, was due to the color "white" set to my materials, in other color, seems working ....