Virtual Box 5.1.4 发布了。更新日志：

• GUI: show actual VM uptime in the session information window

• Audio: re-enabled speakers for Mac OS X guests (5.1.0 regression; bug #15611)

• Audio: fixed crashes under certain conditions

• USB: fixed a hang under certain conditions

• USB: fixed a hanging guest under certain conditions (bug #15747)

• PIIX4: implemented dummy SMBus controller to prevent annoying Linux kernel warnings about uninitialized SMBus base address (bug #9517)

• NVMe: several fixes to improve stability, fixed a crash while saving a VM state

• VMDK: Fixed an issue creating fixed size images with certain sizes and the Split2G option enabled (bug #15748)

• VHDX: fixed cloning images with VBoxManage clonehd (bug #14288)

• Storage: Fixed broken bandwidth limitation when the limit is very low (bug #14982)

• EFI: fixed sending debug messages in the EFI firmware if a serial port is enabled (bug #12161)

• OVF: when importing appliances, make sure that the version of the embedded VirtualBox-specific settings is processed, to get the default settings handling right

• VBoxManage: Don't try to set the medium type if there is no change (bug #13850)

• Linux installer: fixed some scripting issues (bugs #15701 and #15702)

• Linux installer: fixed a path issue on certain Linux distributions (bug #15717)

• Windows hosts: fixed corrupted mouse pointers with some Linux and Solaris guests (bug #15665)

• Linux Additions: made the video driver work on 32-bit guests with large video memory sizes (bug #15621)

• Linux Additions: made the video driver work on kernel 4.7 and later (bug #15769)

• Linux Additions: converted a failure message to an informational one when drivers could not be stopped during upgrade (bug #15692)

• Linux Additions: made the video driver work around an X server bug which cause screen refresh to stop (bug #15511)

• Windows Additions: auto-resizing fixes for Windows 10 guests (bug #15257)

• Windows Additions: fixed VBoxTray problems with Windows 2000 (bug #15661)

详情：https://www.virtualbox.org/wiki/Changelog#v4