Tim
Click on your desktop so FINDER appears in the upper left corner.
While clicking the GO menu tab, hold down the OPTION KEY, and LIBRARY will suddenly appear in the menu selection.
While holding the OPTION KEY still, click LIBRARY.
From the folders in the library, open the PREFERENCES folder. (make sure you VIEW as List, so it is easier to find, since the list will give in alphabetical order)
Scroll down to
com.apple.iWork.Pages.LSSharedFileList
com.apple.iWork.Pages.plist
Tim, I tried draging the preference files to the trash, but did not work for me. Hopefully it works for you. I even had a very nice Senior Advisor from Apple try to help me last night and we still got no where. Even he could not open the Pages 09 document file on his own computer, as I had emailed him a copy.
Just alittle note of what happened to me (21.5" mid-2011 iMac, 2.5 GHZ Intel Core i5, 16GB ram, OS 10.7.5 :
Jan 25, 2013 downloaded Pages 09 (v4.3) from App store to my computer.
By Jan 29, 2013 I had typed a 58 page document using the research template within Pages (5 sections: Cover Page, Table of Contents, Chapter Page, Text Page, Bibliography).
On Jan 29, 2013 from 4:30 pm - 5:30 pm while typing research paper I had no problems "saving a version", at 5:36pm I selected the Bioblography from the section pull down menu and then "saved a version" of the document and planned to 'fill in the Bibliography' after eating dinner.
I came back from dinner and Pages 09, gives me an Error box..... that the document cound't be opened.
I can View the document in Preview, unlike others that said they had the same problem, but could not view their documents in Preview.
But I noticed last night while discussing the matter with the Apple Advisor, that the last page (page 58) is actually blank, rather than having the standard "Bibliography title" at the top, like the template selection has on Pages 09. So something happened within the software when I made a selection from the "sections" pull down menu.
Also, the only other program I had running at the time was iTunes (v10.6.3).
The Apple Advisor even remotely accessed my computer last night but found nothing remarkable and took a copy of the document and hopefully Apple will have an answer and possible something to prevent it from happening to anyone else.