Justin Cohen wrote:
If anyone has suggestions for how I can revert to iPhoto 09 without a Time Machine backup, I'd be much obliged.
Hmmm, that is difficult.
The problem is that an 'upgrade' rewrites a lot of information on your library so you need the old library to swap out.
That's why the process needs to be - rename existing ('11) library, delete the iPhoto '11 application from your applications folder & all the associated files (AppZapper or similar may be the best way to do this) then re-install iPhoto '09 from a back-up or the original discs then put your old iPhoto library back in place from your pre-'11 back-up. Check all works correctly before deleting the renamed '11 library.
If you haven't got a back-up, TimeMachine or otherwise, what you may have to do is to rename your '11 library. Delete the application and all it's associated files (JUST MAKE SURE YOU DON'T DELETE THE LIBRARY!!!)
Then re-install '09 and try this.
Go to the renamed library. Right-click on it. Select 'show package contents'. Find the folder called originals. Drag this out onto the desktop. This folder contains all of your images as they were originally imported to your computer. That means the images will not have any editing changes, tags key-words etc.
In iPhoto '09 select import to library and then direct the import window to this folder and import.
It may take quite some time & your pics will not have changes etc that you may have made but if this is the difference between loosing and saving images then so be it.
I don't know if others have better ideas...