black screen only with two virtual displays

[passt2]

I upgraded my host OS ubuntu from 23.04 to 23.10. In this context virtualbox is upgraded from 7.0.8-1 to 7.0.10.

I'm using a vm with Windows 10 as a guest. It has two virtual displays configured. After the upgrade the vm shows a black screen only. Only when I change the configuration to one display only, the screen is shown correctly.

What can I do to activate two virtual displays in this VM?

[mpack]

We need to see a VM log file. Make sure the VM is fully shut down, then right click it in the manager UI. Select "Show Log" and save "VBox.log" (no other file) to a zip file. Attach the zip here.

[passt2]

NB042win10-2023-11-06-12-29-38.log
This ist the log, when only one display is configured and the screen shows everything.

NB042win10-2023-11-06-12-32-03.log
This is the log, when two displays are configured and the (login) screen is black. I have shutdown the VM by ACPI event.

[fth0]

This is a known problem, solved in VirtualBox 7.0.12 and newer (Changelog for VirtualBox 7.0). As a workaround, keep the second virtual screen enabled when shutting down the VM.