Upgraded to 1803 a little while back. VirtualBox was working fine. Did a reboot today and am now getting a "VT-x is not available" when trying to start VMs.
Hyper-V is off.
WMI "select * from Win32_ComputerSystem" returns HypervisorPresent = True
Enabled Hyper-V, rebooted, disabled Hyper-V, rebooted. No change.
Added "EnableVirtualizationBasedSecurity" reg key, set it to 0, rebooted, no change.
Has anyone else run into this?