VirtualBox v3.1.6 Final is released.VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.

VirtualBox v3.1.6 Final Changelog:
# Linux hosts: fixed timing issue on hosts with Linux kernels 2.6.31 or later with certain CPUs (asynchronous timer mode; bug #6250)
# Linux hosts: properly handle host suspend/resume events on Linux kernels 2.6.30 or later (bug #5562)
# Mac OS X hosts: fixed VBoxSVC crash while enumerating the host network interfaces under certain circumstances
# Snapshots: fixed image corruption after snapshot merge under certain circumstances (bug #6023)
# Snapshots: fixed crash with VBoxHeadless / OSE
# VMM: fixed reference counting guru meditation (bug #4940)
# VMM: improved guest SMP stability
# VMM: fixed VT-x hardware debug issues (bugs #477 & #5792)
# VMM: fixed PGMDynMapHCPage guru meditation (Mac OS X; VT-x only; bug #6095)
# VMM: fixed pgmPoolTrackFlushGCPhysPTInt guru meditations (Mac OS X; VT-x only; bugs #6095 & #6125)
# VMM: Fixed host crash when running PAE guests in VT-X mode (Mac OS X only; bug #5771).
# GUI: fix displaying of error message (bug #4345)
# GUI: fix inability to enter seamless mode (bugs #6185, #6188)
# 3D support: fixed assertion and flickering when guest application uses several windows with a single OpenGL context (bug #4598)
# 3D support: fixed host crashes when using GL_EXT_compiled_vertex_array and array element calls (bug #6165)
# 3D support: fixed runtime linker errors with OpenGL guest libs (bug #5297)
# 3D support: fixed OpenGL extension viewer crash on startup (bug #4962)
# NAT: fixed a 3.1.4 regression on Windows hosts where graceful connection termination was broken (bug #6237)
# NAT: alternative network setting was not stored persistent (bug #6176)
# NAT: fixed memory corruption during ICMP traffic under certain circumstances
# Network: allow to switch the host interface or the internal network while a VM is running (bug #5781)
# VHD: fix for images with a block size different than 2MB
# USB: fixed filtered device attach regression (bug #6251)
# USB: fixed crash in OHCI under rare circumstances (bug #3571)
# VRDP: fixed hang under rare circumstances when attaching USB devices
# ACPI: prevent guest freezes when accessing /proc/acpi for determining the state of the host battery and the AC adapter (Linux hosts only; bug #2836)
# PulseAudio: fixed guest freezes under certain conditions (3.1.4 regression; bug #6224)
# BIOS: increased space for DMI strings
# BIOS: fixed interrupt routing problem for certain configurations (I/O-APIC enabled, ACPI not used; bug #6098)
# iSCSI: be more robust when handling the INQUIRY response
# iSCSI: be more robust when handling sense data
# BusLogic: fixed FreeBSD guests
# webservice: vboxwebsrv is now multithreaded
# Solaris Installer: fixed netmask to stay persistent across reboots for Host-only interface (bug #4590)
# Linux installer: removed external dependency to libpng12.so (bug #6243)
# Solaris Additions: fixed superfluous kernel logging (bug #6181)
# Linux Additions: fixed hang when starting the X server in Fedora12 guests and in guests with Linux 2.6.33 or later (bug #6198)
# Linux Additions: support Mandriva speedboot runlevel (bug #5484)
# Linux Additions: fixed SELinux security context of mount.vboxsf (bug #6362)
# Linux Additions: support Ubuntu 10.04 (bug #5737)
# Web service: update PHP bindings to fix problems with enums and collections

Download: VirtualBox v3.1.6 Final
Source:Here