Virtualbox VM window move/resize broken in 20.04 w. Marco

[nmaxx]

In Ubuntu MATE 20.04 amd64 moving/resizing the window of a VirtualBox VM by grabbing/dragging the titlebar / borders almost never works.
The window just stays put / remains at the same size.

As this does work fine e.g. on an Xfce desktop installed on the same machine, I suspect it to be a bug in Marco.
Note that the main window of VirtualBox is not affected by this, only the VMs themselves.

Package versions:
marco (1.24.0-1ubuntu1) focal
virtualbox (6.1.6-dfsg-1) unstable

GPU: NVidia GTX 1050Ti running with driver 440.64

[Simone (newhere)]

Happens to me too since I installed Ubuntu Mate 20.04. I have to use the right Ctrl key first and then I can grab it. It's quite annoying and should be done as soon as possible.

[nmaxx (nmaxx)]

If it affects you then please also select "This bug affects me" from the "Does this bug affect you?" link at the top of this page - that way it is moved to "confirmed" status.

[nmaxx (nmaxx)]

I also tried Virtualbox 6.1.8 from virtualbox.org => same problem

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[nmaxx (nmaxx)]

Workaround: disable keyboard auto-capture.
See upstream bug: https://www.virtualbox.org/ticket/19593

[Gianfranco Costamagna (costamagnagianfranco)]

This might work now better with 6.1.16 from proposed pocket