Lines around notes in Midi Key Editor

I’ve recently upgraded from Elements 10.5 to 11, and am seeing annoying lines around the notes (underneath each note and on its right hand side) in Midi Key Editor. I’ve tried to attach an image below. This doesn’t happen in 10.5, where the notes are just solid blocks. Is this a glitch in 11, which will get fixed in due course, or does anyone have any other thoughts on what the issue might be. Thanks.

Cubase Elements 11
Windows 10 i5

Just in case anyone has a similar issue it is probably confined to Windows 10 and particular types of display, but it can be resolved (with slight loss of gui sharpness) it by disabling HiDPI in Edit/Preferences/General.