id summary reporter owner description type status component version resolution keywords cc guest host 9097 Ubuntu hangs in VB 4.0.8 when CPU > 1 Radek Antoniuk "The problem is very widely described [http://forums.virtualbox.org/viewtopic.php?f=6&t=36426 here]. VM guest of Ubuntu (fully upgraded), running GNome, is randomly hanging. At the very beginning, it looks like a ""silly window syndrome"". I am able to switch between windows, but I when I try to close any applications, I think they are closed, but the screen GUI stays there. Reboot is impossible (I mean via Ubuntu options, ctrl+r works fine). The problem appears when I set CPU cores to >1. My host machine is running Win7 64-bit, Intel Core I5, M480, 2.67GHz, 6.00 GB RAM. The guest system is 32-bit ubuntu, 2GB RAM, guest tools installed. " defect closed other VirtualBox 4.0.8 fixed Linux Windows