Hi Mark,
I’m using the standard/non-HiDPI version (as is rwfranz, at least based on the post linked below), and haven’t a clue whether it would make a difference. 
[url][LH4669] Not sure if this is a bug, exactly - Misplaced notifications - #19 by rwfranz]
As you experience the bug and we do not, we’re just gathering differences in environment and process, as input to L&L’s debugging.
If I were experiencing this bug, it would be a big deal to me, as I try too maximize navigation by keyboard over mouse. So I am very grateful that I’m not. :mrgreen:
Best,
Jim