On 03/02/2013, at 3:56 PM, Patrick Cusack <livinginlosange...@mac.com> wrote:

> I call the following in my windowControllerDidLoadNib:
> 
>       [[scrollView contentView] setCopiesOnScroll:NO];


Why? Copy On Scroll is usually a good thing. If it's set to NO you have to 
redraw the entire content every time, which is rarely performant or necessary. 
It's not clear whether it's a factor in your problem though, but try setting it 
to YES.

> Should I be calling [ setNeedsDisplay:YES] on my CustomView or on my 
> NSScrollView?


On your view.

--Graham


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