I’m used to dragging the canvas around with middle-mouse drag. This breaks if you accidentally middle-mouse-drag on a node or note (this will move the node or note instead). You can fix by left-mouse dragging the selected item and releasing.
It might be more consistent to have the middle-mouse do only canvas dragging - that way you don’t have to pay attention where you click to move your diagram around and accidentally mess up your setup or block the dragging 
Thanks so much for flagging this with us - I’ll let our engineering team know 
If I have any updates or further questions from them, I’ll update the thread 