First document opened after launching Acrobat Pro DC scrolls normally.Subsequent documents scroll normally in full-page view, i.e. one click on the scroll wheel advances one page in the document. In full-width view, scrolling occurs only in the top or bottom 8-10% of the document window; the remainder of the document window is static. Acrobat Pro DC v2015.009.20069 Windows 7 Home Premium SP1
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