Today I tried a different approach. I installed a fresh Win10 partition on the same PC without removing the existing Win10 installation so I would be able to compare. On the new Win10 I installed Cubase 10 and Halion 6 only, plus my controller’s MIDI/audio driver. Surprisingly, the new installation does not have problems with early MIDI notes, while the older installation (on the same PC) does have issues. Maybe at some point in time some software installation caused an issue on my older Win10. So although I was not able to pinpoint the exact cause, if you experience the same it might be worth making a fresh Win10 install and keeping it dedicated for Cubase use only.
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