Hellooo,
Yes, I have tried that multiple times, I usually do it after a fw upgrade.
Of course it will work the first time I do it, because the factory default is mirror mode (hence only 1 monitor). But when it is switched to span mode after the factory reset, the same error occurs.
If the settings are placed in the xen.ini file, span mode is turned on when the ini is read – before getting a logon screen, which causes a reboot – and still, the same error occurs.