Konsole: graphical mouse pointer disappears

Dear all,

I use a nvidia card (GeForce 980) with nvidia driver G04 (latest from respective repository, 375.25) together with an 4K screen (3840x2160) and KDE desktop. When I start the konsole and move the mouse pointer in that window it changes into a vertical bar, which is OK, but immediately it disappears. That make it impossible to copy any text on the screen.
This is similar problem which I had with Leap 42.1 and a Quadro 5000 card and the previous version of the driver G03.

I think now, it has to do with the high resolution. I use on another Leap 42.2 and less resolution (1920x1200) it works well. Any idea what is wrong here?

Regards,
Florian