In the Preferences, under "Page Display", under "Default Layout and Zoom", under "zoom", your option of "Fit Page" doesn't work. This "Fit page" option is synonymous with the "Fit Height" option that is available through the Acrobat interface. This default option should open all PDF files as one-page per screen. This option used to work in the previous version of Acrobat, but the new version has a bug.
Please fix the BUG. The Fit Page default option doesn't work.