I have both a Mac Mini and an iMac. This problem has actually been present since my original upgrade to Lion but remains an issue with Mountain Lion. When opening Safari it always opens to the last page I visited rather than opening to the home page and new windows might open on any thing I recently visited instead of the home page. In Safari Preferences my preferred home page is selected and show. Under "New Windows Opens With" home page is selected.
Why won't Safari on both of my Macs open to the home page?
mwheelerk: I had the same issue. Under System Preferences>General, there is a choice of "Close windows when quitting an application." It was un-checked. When I checked it, that seems to have corrected the issue and Safari is now opening to my Homepage.