Thank you for your answer.
If I go to the material room, I see all my textures, but nothing appears when rendering.
If I take a new scene, everything is OK, all my textures are rendered.
I have to understand that if I make a first render with Octane with some textures, and if I change some textures of the scene, changes will not appear for me when I re-render. It seems that new textures are in the material room, but are not taken by the octane render (ethen though I refreshed...)
Is it allowed to change a scene after a first render? And how can I refresh all the textures?
Thank you for your help...