VirtualBox 4.3.22 Build 98236

What's new in this version:

- VMM: refined measurement of TSC frequency on the host, improves timekeeping for guests
- VMM: decreased CPU load resulting from guest MMIO writes to the virtual APIC
- VMM: fixed interception of debug exceptions, observed while using the dbx debugger on Solaris guests (VT-x only)
- GUI: 3D overlay window positioning code improved, fixed potential misplacement of 3D accelerated guest graphics content
- GUI: fixed accident SSL authentication failures during update check on Windows hosts
- GUI: never send the "ACPI power" keyboard scancode to the guest, we have the ACPI power button for that
- GUI: was unable to properly restore seamless mode VM from snapshot/saved-state under some circumstances
- VBoxHeadless: don't crash if 3D is enabled in the VM settings
- ATA: fixed several passthrough issues
- Audio: fixed DirectSound failure when the the host has no audio input device (Windows hosts only)
- SB16: fixed compatibility issue
- Storage: fixed broken CD/DVD passthrough when using the IDE controller
- NAT: new ping proxy for Windows hosts
- NAT: Properly report outbound connect(2) failures to guest with TCP RST or ICMP
- NAT Network: no need for frequent wakeups in VBoxNetDHCP and VBoxNetNAT
- Host-only adapter: prevent Windows from creating an "Unidentified network"
- Bridged Networking: don't leak host-to-guest traffic to the wireless network when bridging to a wireless interface
- Main: fixed a possible race when changing the medium leading to a deadlock under rare conditions
- VBoxManage: fixed return code if starting a VM failed
- API: fixed 2 deadlock opportunities related to medium handling (bugs #13789, #13801, thank you Alexander Urakov)
- API: fixed bug in XPCOM which created too few worker threads, sporadically resulting in a deadlock
- SDK: fixed a garbage collection leak in the Python VirtualBox webservice API binding
- Linux hosts: fixes for activated SMAP (
- X11 guests: prevent unwanted hiding of guest screens on multi-monitor guests
- X11 guests: added support for X.Org Server 1.17
- X11 Additions: fixed a memory leak in VBoxService if libdbus is available but dbus-daemon isn't running
- Windows Additions: prevent VBox WDDM driver from loading if host reports weak OpenGL capabilities. 3D content now can be shown over Remote Desktop connection.
- Winodws Additions: some fixes for recent Windows 10 Previews
- Linux Additions: fixed a compatibility issue with 64-bit Linux 2.4 kernels
- Linux Additions: fixed a potential use-after-free when unloading the VBoxGuest module
- Linux Additions: Linux 3.19 fixes