This is happening with both EP1 and EP2 files in Aperture (but not any other camera).
Sometimes when you click on a file it says 'loading' and comes up fine, at other times, and seemingly at random the file will look something like this:
looking at it again later and it will look normal again
Then, next time it might look like this
I've tried reinstalling the raw update to no avail.
any ideas anyone?
As an addendum - this also happens if you preview the files in the finder with aperture closed!
this didn't seem to be happening a few days ago