Data loss -- managed photos mis-badged as missing referenced photos

I always import all photos as managed photos, and never use referenced photos. Yesterday, I noticed that the last 29 photos from a group of 96 photos imported Feb 18 were badged as "The referenced image’s master file has not been found."
Indeed, although I had worked on many of these images in Aperture shortly after importing them, I could now only view a large but low-res thumbnail.
Weirdly, when I right-click on one of these images and select "Manage Referenced Files..." I get a message that "The selection doesn't use any referenced files." I get the same message when I select "Manage Referenced Files..." from the File menu with the entire project selected.
Using the Finder, as well as the find and locate commands in the terminal, I have verified that the missing images are not on my main or backup hard drives (unfortunately, I use a simple rsync script for backup, and I didn't discover this problem until after the deletions had propagated to my backup).
The other 67 photos imported at the same time (same import group) seem fine, and, using the Finder, I can locate all of them in the Aperture library.
To test one user error scenario, I imported some test photos into the Aperture library and then relocated the masters to the desktop. I then quit Aperture, deleted the photos on the desktop, and relaunched Aperture. As expected, the test photos had the same "The referenced image’s master file has not been found" badge, but when I right clicked and selected "Manage Referenced Files..." I got the expected dialog, unlike when I select the same option for the missing 29 photos.
Any ideas what went wrong?
G5 iMac   Mac OS X (10.4.8)  

Thanks for responding...
It sounds pretty odd. First try to rebuild the
database...as was suggested (Option>CMD on launch of
Aperture).
I will try this eventually. But I want to get some insight first, in case this could create more problems than it solves. I am also holding off on updating to 10.4.9 for the same reason.
This might help. If not, try to make an
adjustment on one of the images. This will force the
thumbnail to redraw. If the adjustments aren't
available for that particular image, then the image
is really offline somewhere.
I am unable to make any adjustments on these images.
I assume you went into your Library "Show Package
Contents" to confirm they are missing. If not, try
that.
Yes, the images are not in the folder with the other images from that import. Further, I used the unix 'find' and 'locate' commands to search my entire hard drive and backup drive, and the images were not found.
Can you Export the image?
That was how I first stumbled on this problem -- I tried to export and got an error message that "Versions with unavailable master images cannot be exported."
The weird thing is that when I try and get the 'Managed referenced files...' dialog, Aperture claims that "The selection doesn't use any referenced files" -- that tells me this data loss might be the result of a bug and not user error.

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    That's the problem. Nobody has to actually save to wipe data out with Lion. Versions _does not work_ on server volumes. I have tested this with Lion client and 10.6 server and 10.7 server. Same result. Massive data loss.
    > Plus, any document over two weeks old would pop-up a big "locked" dialog if the user tried to modify it in Lion. You wouldn't get that before.
    Great. Documents can only be inadvertently destroyed for two weeks. Not sure how this makes anything better.
    >And why do you have Time Machine on the desktop instead of on the Server? It seems like it would more handy there.
    The server is backed up, as are the clients. It's irrelevant to the problem being reported.
    >You are the network administrator. Disable Preview and get your users a decent image editor.
    Great idea! Until Photoshop supports versions. Microsoft has announced support for versions with office. I guess we'll have to disable that as well. Maybe we should try to fix the actual problem rather than just disabling software that used to work perfectly and moving on...
    > The Versions feature is absolutely not appropriate for use in a multi-user context.
    I agree. So do mac users stop using servers now? Doesn't seem like a good option.
    > I find it hard to believe that any competent administrator would 1) upgrade clients to Lion this soon after release
    I have no clients except my own on Lion at this point, for testing. This is exactly the kind of problem I need to trace down before I deal with huge issues from my users. Also, what happens when we buy new machines? Lion only...
    > and 2) have versions enabled on shared disk.
    We can turn off versions on a shared disk? I do not see any way to do this. Please enlighten me!
    > 1) There is no evidence that the original poster has actully upgraded any client or is a network administrator.
    I am a network administrator. This only happens with Lion and versions. I have tested this problem against both 10.6 server and 10.7 server. It exists on either.
    > 2) Version is a feature of Lion, not the network. The scenario described by the original poster could occur on any non-HFS+ disk.
    The problem is that versions _does not work_ on an AFP server, but acts as if it does. When you use "revert to save" you find that there are no versions. Not good...
    Joel

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