Here you go. As posted by ygor in post #406.
Works for me on an HP N36L and HP N54L; both running DSM 6.1.4-15217 Update 2. I had VirtualBox_x64_5.0.40-115130-1 running on both microservers under DSM 6.1.3.
Process to upgrade:
1. Uninstall Virtualbox
2. Upgrade to DSM 6.1.4-15217
3. Install VirtualBox_x64_5.1.30-118389-1
If you are having trouble, make sure User Homes is enabled (Control Panel > User > Advanced), also ensure you follow the install directions closely. Finally, make sure to enable personal website in Web Station. Good Luck!
VirtualBox_x64_5.1.30-118389-1.spk