id summary reporter owner description type status component version resolution keywords cc guest host 9050 Crash After Upgrade Jonathon "I upgraded to the latest version a few weeks ago and since then my Windows installation will not start. I get the following error: Failed to open virtual machine located in /Users/winlynx/VirtualBox VMs/Windows/mswindows.vbox. Medium '/Users/winlynx/VirtualBox VMs/Windows/Windows.vdi' cannot be closed because it is still attached to 1 virtual machines. Failed to open virtual machine located in /Users/winlynx/VirtualBox VMs/Windows/mswindows.vbox. Medium '/Users/winlynx/VirtualBox VMs/Windows/Windows.vdi' cannot be closed because it is still attached to 1 virtual machines. It worked great until the upgrade any advise would be appreciated. Thanks in advance for looking at this problem." defect closed virtual disk VirtualBox 4.0.8 worksforme crash after upgrade Windows Mac OS X