Hi Pilou,

> Step 1 Right click on the eyes of the Cube ok
> Step 2 clikc + SHift on the Text of red label OK reds cubes are selected
> Step 3 Inverse selection curiously don't works!

I guess you must have some sub-objects selected of the cubes, like faces are selected instead of "whole objects".

When you have a sub-object selection then doing an invert selection will only invert the selection of those sub-objects.

Another thing that you can use instead of inverting the selection is to right-click on the Edit > Hide button - doing a right-click on that button will perform an "Isolate" function where it hides everything other than what is currently selected.

- Michael