On Apr 22, 2014, at 15:36 , Eric Shepherd <the.she...@gmail.com> wrote:

> When the cursor is at the top edge of my window, the Y value is off by 10 
> pixels.
> 
> When the cursor is at the bottom edge of my window, the Y value is off by 40 
> pixels.


As I suggested previously, this could indicate that your view bounds have been 
inadvertently scaled.

The next thing you must do is log more environmental information. I suggest:

— the view’s visibleRect
— the view’s bounds
— the view’s frame
— the window content view’s bounds
— the window content view’s frame
— the window’s frame
— when the cursor is at the top edge of your view, event.locationInWindow in 
window coordinates
— when the cursor is at the top edge of your view, your ‘where’ variable (that 
is, event.locationInWindow converted to bounds coordinates)
— when the cursor is at the bottom edge of your view, event.locationInWindow in 
window coordinates
— when the cursor is at the bottom edge of your view, ‘where’ (bounds 
coordinates)


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