[DonC]

Hi Mike,
So, I've got V3.8.37 up and running.
The custom stamp clipping is now OK.
On the other hand I still have the black pages just showing annotations.
And there is a new problem that I hadn't noticed before.  
When leaving the annotation mode with the X in the upper left corner all the annotations are removed from the page.
Changing the page all is well, and then going back to the page where the annotations were removed they reappear.

Note for the black pages problem I can provoke this happening:
In half page mode load a larger piece like a symphony score, immediately when the first page is shown swipe left to change the page, the second half of the second page will be black with just the annotations.
If I wait even just 2 seconds the problem no longer happens.
I note that when a piece is loaded there is a short wait with the spinning dots before the page is shown. 
If I swipe immediately after the first page is shown the spinning dots show up again very shortly.
If I let those 2 seconds pass the spinning dots are not shown when swiping.
I hope that gives you some clues as to what might be happening.

Best, Don