Weird problem using SetPixels on a imported mesh

Hi all!

I'm implementing a telesketch, but, i have a problem with the screen.

I tried using a Unity plane as the screen, and when my script draws on the generated texture, i can see the modified texture in the plane.

But, if i use a custom plane created in Blender, i can see the texture modified in the texture preview at the screen properties, but in the game area, the screen remains untouched, the texture doesn't update.

See ya!