> I have to correct a misunderstanding: the first responder has nothing to do 
> with scroll events.  Scroll events are delivered to the view under the mouse 
> cursor.  

Thank you for the correction Ken. That point had slipped my mind– of course the 
first responder isn’t necessarily going to be the destination for scroll events.

> I would check for third-party code injection software or something running an 
> event tap.

I’ll do that, but I don’t suspect it’s a factor here. I’ve had a few users 
report the problem, and they don’t seem to have any such software in common.

The one thing that does seem to be a factor is my document window’s drawer (ie: 
NSDrawer). Although my testers don’t have an exact list of steps to trigger the 
problem, it seems that interacting with the drawer is necessary. I know drawers 
are passé, so my fear is that they’re falling into disrepair. This problem has 
only been reported by users on OSX 10.10.x.

Anyways, I appreciate your reply. I’ll continue to work with my testers and see 
if I can’t narrow down the cause.

~Martin Wierschin


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