Problems with large scanned images

I have been giving Aperture another try since 1.1 came out, and I am still having problems with large tiff files derived from scanned 4x5 negatives. The files are 500mb or more, 16 bit RGB, with ProPhoto RGB or Ektaspace PS5 profiles, directly out of the scanner.
Aperture imports the files correctly, and shows their thumbnails. When I select a thumbnail "Loading" is displayed briefly, and the the dreaded "Unsupported Image Format" is displayed. Sometimes "Loading" goes on for a while, and a geometric pattern (looking like a rendering of random memory) is displayed. Restarting Aperture doesn't help.
Lower resolution (250mb, 16bit) files are handled properly. The scans are from an Epson 4870 scanner. I have tried pulling the scans into Photoshop and resaving with various tiff options, and as PSD with no improvement. I have the same problem with corrected/modified psd files coming out of Photoshop CS2.
I am running on a Power Mac G5 dual 2ghz with 8gb of RAM and an NVIDIA GeForce 6800 GT DDL (250mb) video card, with all the latest OS and software updates.
Has anyone else had similar problems? More importantly, is anyone else able to work with 500mb files of any kind? Is it my system, or is it the software? I sent feedback to Apple as well.
dual g5 2ghz Mac OS X (10.4.6)

I have a few (well actually about 100) scans on my system of >500Mb. I tried loading a few and am getting an inconsistent pattern of errors that correlates with what you are reporting.
I imported 4 files and three were troubled, the fouth was OK. I imported another four files and the first one was OK and the three others had your reported error, also the previously good file from the first import was now showing the same 'unsupported' image' message.
I would venture to say that if you shoot primarily 4x5 and work with scans of this size that Aperture is not the program for you--right now. I shoot 35mm and have a few images that I have scanned at 8000dpi on my Imacon 848 but most of my files are in the more reasonable 250Mb range (35mm @ 5000dpi).
I will probably downsample my 8000dpi scans to 5000dpi and not worry to much about it. In a world where people believe that 16 megapixels is hi-res you are obviously on the extreme side.(Good for you!) You should definately file a bug report but I wouldn't expect much help anytime soon for your super-sized scans.

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