@Armand hello,
Thank to the team for the new update! 
Unfortunately the mentioned problems in this topic are still there. Only the stuttering effect during the playback (when HiDPI - “Windows Scaling”, or higher is enabled) is reduced, but still not completely resolved.
The grid layout problem fully exists at Windows Scaling and +25% (I didn’t check for +50%). Below is attached a screenshot of Cubase at Windows Scaling (in my case at 125% HiDPI). The enclosed grids in green are fine, but those in red are not looking correct.
My video interface is GeForce - Quadro 4000, 2GB RAM
Workstation - HP Z820, 2x8-core Xeon E5-2670 @ 2.60 GHz, 64GB RAM @ 1333 MHz.
Monitor - Dell P2416D (QuadHD, 23.8 inches)
I don’t have any issues regarding HiDPI with Dorico Pro 3.5, nor with Studio One 5.2 Demo.
Armand, you mentioned that every software renders the graphic differently… Probably Cubase should completely change it’s way?! After the HiDPI problems can’t be fixed since the integration of this feature. For the others took not more than two major updates to completely integrate it. In Cubase we don’t have working HiDPI since it’s integration in version 10.0.
I hope very soon we’ll have fully working HiDPI in Cubase!
Best wishes and success,
Thurisaz