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* USB: don't crash if a USB device is plugged or unplugged when saving or loading the VM state (SMP guests only) * Storage: added readonly support for VHDX images * Storage: added support for QCOW (full support for v1 and readonly support for v2 images) * Storage: implemented support for discarding unused image blocks through TRIM for SATA and IDE and UNMAP for SCSI when using VDI images * Storage: fixed audio CD passthrough for certain media players * Storage: implemented burning of audio CDs in passthrough mode * NAT: fixed memory leak when disabling the NAT engine * NAT: improvements for the built-in TFTP server * Settings: allow to store the iSCSI initiator secret encrypted * Settings: sanitise the name of VM folders and settings file It can be enabled at any time using the VM menu. * Clipboard: disable the clipboard by default for new VMs (see Section 13.3.2.3, “Clipboard”). * Snapshots: fixed a crash when restoring an old snapshot when powering off a VM * GUI: if a bridged network interface cannot be found, don't refuse to start the VM but allow the user to change the setting immediately * GUI: consider scaled DPI values when display fonts on Windows hosts * GUI: don't crash on terminate if the settings dialog is still open * GUI: do not create additional folders when a new machine has a separator character in its name

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* GUI: show the full medium part on hovering the list of recently used ISO images * GUI: allow to globally limit the maximum screen resolution for guests * GUI: allow reset, shutdown and poweroff from the Manager window * GUI: allow starting of headless VMs from the GUI * GUI: allow automatically sorting of the VM list * GUI: allow taking screenshots of the current VM window content * VMM: fixed handling of task gates if VT-x/AMD-V is disabled * VMM: fixed MP tables fixes for I/O APIC interrupt routing relevant for ancient SMP guests (e.g. * VMM: fixed unreal mode handling on older CPUs with VT-x (gPXE, Solaris 7/8/9)

* VMM: added support for FlushByASID features of AMD CPUs (Bulldozer and newer) * VMM: improved VM context switch performance for Intel CPUs using nested paging

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* VMM: fixed a potential host crash under a high guest memory pressure (seen with Windows 8 guests) * VMM: fixed a potential host crash triggered by shutting down a VM when another VM was running (only affected 32-bit hosts and 64-bit OS X hosts, 4.1 regression)

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* Mac OS X hosts: sign application and installer to avoid warnings on Mountain Lion

# In addition, the following items were fixed and/or added: * Enhanced API for controlling the guest please see the SDK reference and API documentation for more information * Added support for parallel port passthrough on Windows hosts

Support for more guests and for guest-to-host is planned. * Added experimental support for Drag'n'drop from the host to Linux guests. * Added possibility to start VMs during system boot on Linux, OS X and Solaris see Section 9.24, “Starting virtual machines during system boot” * Resource control: added support for limiting network IO bandwidth see Section 6.9, “Limiting bandwidth for network I/O” * Support for up to 36 network cards, in combination with an ICH9 chipset configuration * GUI: allow to alter some settings during runtime * Improved Windows 8 support, in particular many 3D-related fixes # The following major new features were added:

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