Peter:
Thanks for the update link. Updating to Pages 4.0.3. did the trick! Now Pages '09 works on my Mac (10.10.1).
Martin:
Your approach seemed a little too much effort for me 🙂, so I took another approach. My goal was to convert all my Pages docs to Word docs as I don't trust Pages any more (nor Numbers or Keynote).
First, I created an Automator script to find all my Pages files, using these draggable Actions:
* Get Specified Finder Items: I "added" my Documents folder.
* Get Folder Contents: I checked "Repeat for each subfolder found".
* Filter Finder Items: I used "Kind...is...other...pages" (I typed in "pages"; it also worked for "numbers" and "keynote"). After I ran the script, clicking on "Results" showed me the list of Pages files.
(I'm not including my script since you should never run a script from someone you don't know, IMO.)
I double-clicked each file to open it up in Pages, and from there, exported to Word (likewise Numbers -> Excel, Keynote -> PowerPoint). I then deleted the original Pages file.
For me, my problem is solved, albeit it took me a couple of hours.