Right now I'm on the free trial checking out HM3 to see if I should make the move from 2 to 3.
One bug I found is that if I want to take a note on a player seated near the left boarder of my screen,
the note pop up opens outside of the view of my display.
It is not possible to drag it on screen.
I use two monitors and it happens on the left border of my left monitor only.
Playing on Pokerstars (if that matters).