Can't select combobox item with mouse under Debian v9.1

[Zoltan Karpati]

The mouse can make the drop down appear like normal, but when the mouse hovers over the items they are not highlighted and clicking on one does not close the drop down and does not select the item.

I am using the RAD Studio 10.2 Tokyo and FMXLinux v1.11 and I did try the official ControlDemo also.

[Zoltan Karpati]

Under LXDM it does not work on my collegues real PC. I have installed under my VMWare system the Debian 9.1 system with Xfce desktop and it works fine.

[Mathieu]

Same problem on debian 9.1 64bits with KDE.

Same problem on another PC with debian 9.1 64bits with gnome.

But it works on another PC with debian 9.1 64bits with gnome!

Strangely, we've got another problem which appears on the same (first two) PC: we can't click on any button on a children form of our app.