CST Multicore simulations trouble

Hello
I'm using CST 2011 to simulate antennas in two different computers: a server with 8 cores and a laptop with 4. I've set the number of CPU's for both computers.
When I run a simulation, CST uses 4 cores in the server and 2 in the laptop. It shouldn't be a license trouble. I also tried to set the double of core numbers, but it does not work.
Does anyone know the reason? I've looked in the forum, but I haven't found anything about it.
Thank you!

Nobody has an answer? :(