Changing date of scanned jpg will corrupt it

Strange and dangerous behavior of Aperture 3: When I scan a photo with VueScan as a jpg, import it into Aperture and then change the date of the picture via the metadata change dialogue, the file becomes corrupted and completely unusable. I tried this with many jpg, even used GraphicConverter to change the jpg, reimported it in Aperture and the same effect came up.
Does anyone have any solutions to this or is is an Aperture bug?

I'm seeing this problem too, although with TIFF files, I haven't yet tried JPGs.
The files seem to be fine providing one *does not* tick/check to update the Master file.
I can change the date outside Aperture (using PhotoMechanic) with no corruption so this would appear to be an issue with the way Aperture is writing the EXIF back to the original file.
DG

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