Strange thing happens, when I open the taskmanager during the build both the cpu's are working on the same level (load about 50%).
But when I set the slider to 1 cpu to be used both cpu's keep working.
So now I have set the slider to 3 cpu's to be used, same effect and no expected error because I only have 2 processrs.
Now I beginning to think that it does not mather when you move the slider on what number of cpu's to be used, it always uses the number of processors availeble on the computer (unless ofcource I turn 1 processor off in Windows).
What do you think?

Regards,
Frits