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VirtualBox stopped working with the update to 10.8.2

I just upgraded to 10.8.2 and VitualBox stopped working.


This is the error:

Failed to open a session for the virtual machine dev_env_oraxe.

VT-x is being used by another hypervisor. (VERR_VMX_IN_VMX_ROOT_MODE).

VirtualBox can't operate in VMX root mode. Please close all other virtualization programs. (VERR_VMX_IN_VMX_ROOT_MODE).

Result Code: NS_ERROR_FAILURE (0x80004005)
Component: Console
Interface: IConsole {db7ab4ca-2a3f-4183-9243-c1208da92392}


Does anyone have a clue?


I don't want to be forced to restore from backup.


Thanks

MacBook Pro with Retina display, OS X Mountain Lion (10.8.2)

Posted on Sep 19, 2012 2:20 PM

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Sep 20, 2012 9:58 PM in response to qwertme

I called Apple up, they seem to think they didn't disable hardware virtualization - VT-x just changed the way it can be accessed. If a way to access this isn't restored, the software virtualization route that will likely need to be taken is far from ideal. Especially since we had VT-x before this firmware upgrade.


This does not only affect VirtualBox, Parallells, or VMware though, it also affects things like CrossOver which is rather interesting.

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Sep 21, 2012 4:57 AM in response to Ammasuddet

To downgrade to 10.8,


1. Grab a copy of the OS X 10.8 InstallESD.dmg.

2. Use Disk Utility to restore to a USB drive (minimum 8gb).

3. Boot from USB (Hold down Option key when booting).

4. Make sure you're disconnected from the Internet (prevents the installer from auto updating).

5. Select "Reinstall Mac OS X"

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Sep 21, 2012 5:07 AM in response to qwertme

Same here. Just updated to 10.8.2 (12C54) and got the following error -


VT-x is being used by another hypervisor. (VERR_VMX_IN_VMX_ROOT_MODE).



VirtualBox can't operate in VMX root mode. Please close all other virtualization programs. (VERR_VMX_IN_VMX_ROOT_MODE).



Result Code: NS_ERROR_FAILURE (0x80004005)

Component: Console

Interface: IConsole {1968b7d3-e3bf-4ceb-99e0-cb7c913317bb}

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VirtualBox stopped working with the update to 10.8.2

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