Light problem

Hi all

First I’m sorry for my very bad English.

I have a problem, I am a novice with JMonkey and I have a problem the tutorial #2 (asset:

All work fine but I don’t have light (see the picture). My code is identical as the tutorial

Have-you an idea?

I have an AT X1300pro Graphic Card with the last driver.

I have the same problem with the demo executable.

Thanks for your help