Big Mike 

OK, I will try this right now. I assume if it works, the second instance (DOM only) should have proper HOD/LOD markers that match the profile. Let's see. Mike

Nope. No change. I forced both instances to "run as Administrator". The HOD/LOD markers on the DOM are 1 tick apart (since I just reloaded), not matching the accurate profile data for the session.

The correct data is there -- profile has correct high/low -- but the HOD/LOD markers aren't using it.

Mike

a follow-up:

Sierra added a new feature (new to me)
to deactivate the "default" HoD/LoD lines of the DOM.

under CHART > GRAPHICS SETTINGS :



So one can deactivate the default lines and use the workaround , described above.
This gives you the ability to choose your own session times and the fitting HoD/LoD.

(They did a great job in adding this feature - but why is it a "secret" and was not announced )