I tried reinstalling/updating to the latest version of VirtualBox, but it did not help.
Update: I managed to disable VT-x by following the procedure described at http://tech.techteam.gr/virtualbox-vt-x-problem-cannot-disab... and starting the virutal machine with VBoxHeadless. However, this immediately made my host machine completely lock up, so I cannot recommend it :)
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I see the same thing.
I tried reinstalling/updating to the latest version of VirtualBox, but it did not help.
Update: I managed to disable VT-x by following the procedure described at http://tech.techteam.gr/virtualbox-vt-x-problem-cannot-disab... and starting the virutal machine with VBoxHeadless. However, this immediately made my host machine completely lock up, so I cannot recommend it :)
I was told in virtualboxes's irc to check back tomorrow for an update. apparently the devs aren't around right now.