opt_step а если так
VirtualBox 4.1 Beta 1 relased Скачать можно
отсюда [more=ChangeLog - тут]
VirtualBox 4.1 will be a new major release. The following major new features were added: -Support for cloning of VMs (bug #5853)
-GUI: enhanced wizard for creating new virtual disks
-GUI: new wizard for copying virtual disks
-VMM: raised the memory limit for 64-bit hosts to 1TB
-Windows guests: Experimental WDDM graphics driver
-Guest Additions: modules and features now are represented as facilities to have a common interface for frontends.
-New Networking Mode: UDP Tunnel. Allows to interconnect VMs running on different hosts easily and transparently, see the manual for more information.
In addition, the following items were fixed and/or added: -VMM: more SMP timer fixes
-VMM: fixed sporadic recompiler crashes with SMP guests
-VMM: many small fixes
-GUI: when reverting to a snapshot, ask for taking a snapshot of the current state
-GUI: added View menu
-GUI: added setting for the promiscuous mode policy for internal networks, bridged networks and host-only networks
-GUI: the VM description is editable during the runtime of a VM
-GUI: added proxy settings (bug #2870)
-VBoxManage: changed syntax of the guestcontrol command group, fixed various bugs
-VBoxBalloonCtrl: new service for automatic dynamic adjustment of the balloon size for running VMs
-Settings: machine names and snapshot names are not allowed to be a valid UUID
-Storage: virtual CD/DVD images will be detached if the guest ejects the medium
-Floppy: several bugs have been fixed
-BIOS: disk-related structures are now checksummed correctly
-USB: many fixes for the Windows USB host driver
-NAT: reduced memory footprint
-Serial: announce the serial devices in the ACPI tables to make Windows guests find the virtual hardware (bug #7411)
-VRDP: support for TLS connections
-VRDP: support for multimonitor client configurations with MS RDP client
-3D support: fixed GL_VERSION string for different locales (bug #8916)
-Windows hosts: fixed copy'n'paste in the GUI and for the VM window (bug #4491)
-Guest Additions: improved driver installation on Windows guests
-Guest Additions: fixed high CPU usage while executing guest programs from the host
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