Thanks Gideon.
Turning on the layer backing for all those levels did fix the redrawing problem.
I didn't find out how to fix the layer drawing when the bounds origin has been
moved, but I did work out a workaround.
I added an instance variable to my view (the scrollview's document view):
@pro
I knew I was going to want to do something like that myself so created a small
test project.
You need to have the scrollview, the clipview, and the document view all layer
backed for it to work with the scrollview magnification. You shouldn't need to
explicitly set the autoresizesSubviews on. I
