In VirtualBox 4.2.4 with a Windows 7 host, I was previously able to create VMs and have multiple display windows appear. If I power on a VM with multiple monitors or create one, only the first monitor will appear. I've cleaned out the .VirtualBox directory, done a MSI repair on it to see if it is a host foul-up. The vbox.log files don't mention any errors.
Is there any other way I can figure out if some host patches, configuration or if VBox itself is somehow hosed?