When I open a PDF, and select View/page display/enable scrolling - it doesn't work. I have discovered (trial and error) that if I change the window size (click on bottom corner and drag/resize diagonally a little, larger or smaller) that that seems to correct the enable scrolling issue. It is frustraitng to have to do that with each PDF I open, since I review multiple-paged PDFs a good bit of the day. Please fix it. Thanks. (iMac user)