With Windows 10 host, VirtualBox guest window jumps between monitors

[Aren Cambre]

With a Windows 10 x64 host using multiple monitors, the VirtualBox guest window now jumps between monitors. When it jumps, it always jumps from monitor 2 (extended desktop) to monitor 1 (main desktop). It jumps under these circumstances:

• resizing guest window, especially when the mouse cursor is close to the screen edge
• when guest window changes from text only mode to GUI mode (guest is Ubuntu 15.10, so it starts in text mode upon boot and switches back to text mode for a several seconds at the end of a shut down)
• when moving guest window while mouse is close to screen edge

I am aware of Windows's Aero Snap feature, starting with Windows 7, where dragging windows to the edge of the monitor causes the windows to be maximized or positioned differently. I am not activating this feature. Also:

1. this feature does not cause windows to jump between monitors
2. this feature did not cause problems with VirtialBox when using Windows 7, 8, or 8.1 as a host
3. no other program on my PC exhibits this behvaior

This happens despite the fact that I clean installed Windows 10 and VirtualBox twice. This has happened with all versions of VirtualBox that came out since about a month after Windows 10 RTM was released.

I normally have VirtualBox close to maximized in my monitor 2. By close to maximized, I mean I have about a 10-20 pixel margin around all sides of the guest OS window. That means I am having to drag the guest OS window extents near to but not at the monitor edge.

I am actually on VirtualBox 5.0.8. That was not available as an option in the Version dropdown.

(#12209 could be related, but I don't think it's the same.)

[Aren Cambre]

This is no longer happening.