Nope, just editing the first picture I see (I'm assuming it's the original version)
So here's the solution I've come up with:
- I fix the red eye on all the photos I need to, marking them with a star or whatever.
- I export all those photos into a subdirectory.
- Then I delete the entire project from Aperture, go into Finder and move the exported photos back into the original directory (overwriting the photos with red eye).
- Then I go back into Aperture and recreate my project.
- Voila, an entire project with no red eye on the Master photos.
It's cumbersome, but it works. I would obviously only do this the first time I import the photos to avoid overwriting any other edits.
Oh boy, something has gone seriously wrong in your workflow: you are so fixated on the »original« that you sidestep the workflow suggested by Aperture (and Lightroom).
Is there some kind of hidden danger to what I'm doing?
To answer your question: there are no hidden dangers, the risks to your solution is in plain sight:
(1) Your workflow is destructive: if you eff up an aspect of editing the original, you cannot revert after re-importing. If you shoot in RAW, you also lose a lot of color information since I assume you export your images as jpg. If you export them as tiff, the resulting files are
much larger than the RAW file you started with which slows down your workflow (e. g. the 16 megapixel RAW files of my D7000 weigh in at about 20 MB each, perhaps 25; a 16 bit tiff of the same resolution takes up 91 MB of space!). If you decide to render one photo in two different ways in the end, it takes up 182 MB instead of 25 MB!
Allowing for a fully non-destructive workflow is the most significant advance that was introduced with Aperture 1.0, i. e. the principle that you never, ever, ever touch the original.
(2) Your workflow is a lot more complicated than it needs to be.
(3) You don't quite understand what a master is: what you do with your workflow is to make the rendered file the new master.
I also don't see any upside to working this way: you can always create a version from the rendering of the master where you have already removed the red eyes.