On 16/03/2012 06:14, Dietmar Maurer wrote: > And it works if you use a host with another CPU model? Yes. I have 4 nodes: Two with Intel(R) Xeon(R) CPU E7- 4850 @ 2.00GHz Two with Intel(R) Xeon(R) CPU L5630 @ 2.13GHz The ones with Xeon E7 are causing the trouble under Windows 2003 x64.