I have been playing around with AppKit programming and I have a sample document based app with a scroll view and rulers. When The scrollbars are not overlay style (which is usually true for me because I have "show scroll bars always" set in preferences) and the rulers are on The clip view seems to extend throughout the scroll view and the document can be seen through the scroll bars. However if I turn the rulers off, then the clip view seems to not include the scroll bars, and so the document is not visible through the scroll bars, having been clipped to the rectangle that lies inside the scroll bars. Additionally in this case, the small area in the lower right hand corner of the screen between the two scroll bars is white, even though all of my views have a light gray background. If the scroll bar style is overlay, then everything seems to work as expected: the clip view always includes the scroll bars. Is this a bug related to legacy style scrollbars or (more likely) have I just screwed something up? I should add that the window and the entire view hierarchy have been built programmatically. It is not in the xib.