Hi, I'm having the hang on boot issue with El Cap, but it doesn't appear to be virtual box related. Here is the Kext listing please tell me if you see something else that could be causing this!
-bash-3.2# cd "/Volumes/MacHD" ; ls -1 Library/Extensions/ ; ls -1 Library/Application\ Support/VirtualBox/ ; ls -1 Library/Application\ Support/EltimaSyncMate/ ; find System/Library/Extensions -ctime +1w -depth 2
ACS6x.kext
ATTOCelerityFC8.kext
ATTOExpressSASHBA2.kext
ATTOExpressSASRAID2.kext
ArcMSR.kext
CalDigitHDProDrv.kext
HighPointIOP.kext
HighPointRR.kext
PromiseSTEX.kext
SoftRAID.kext
Unsupported
ls: Library/Application Support/VirtualBox/: No such file or directory
ls: Library/Application Support/EltimaSyncMate/: No such file or directory
System/Library/Extensions/AppleHIDTransport.kext/Contents
System/Library/Extensions/AppleInputDeviceSupport.kext/Contents
System/Library/Extensions/AppleKextExcludeList.kext/Contents
System/Library/Extensions/AppleMIDIBluetoothDriver.plugin/Contents
System/Library/Extensions/AppleMIDIFWDriver.plugin/Contents
System/Library/Extensions/AppleMIDIIACDriver.plugin/Contents
System/Library/Extensions/AppleMIDIRTPDriver.plugin/Contents
System/Library/Extensions/AppleMIDIUSBDriver.plugin/Contents
System/Library/Extensions/Belcarra.USBLAN_netpart.kext/Contents
System/Library/Extensions/Belcarra.USBLAN_usbpart.kext/Contents
System/Library/Extensions/DVFamily.bundle/Contents
System/Library/Extensions/EAP-RSA.ppp/Contents
System/Library/Extensions/JMicronATA.kext/Contents
System/Library/Extensions/NVMeSMARTLib.plugin/Contents
System/Library/Extensions/RemoteControl.USBLAN_usbpart.kext/Contents
System/Library/Extensions/SiLabsUSBDriver.kext/Contents
System/Library/Extensions/SMARTLib.plugin/Contents
System/Library/Extensions/System.kext/PlugIns
Thanks!