Fusion 10 on High Sierra existing and new VMs do not start, get Internal Error

Installed Fusion 10 this afternoon, no vm will start now. Linux, Windows or MacOS get the same Internal Error. Have created a new VM, does not start with the same error. Have rebooted the MacBook Pro, no change. Tried adding mks.enableMTLRenderer = "0" to the vmx file, no change. The vm was paused when I upgraded Fusion, have gone in and remove the.vmem, .nvram files, no change.