Photos suddenly way too dark?

Okay, here's the info:
-Just updated to Mavericks (works fine)
-Updated iPhoto
-When I launch iPhoto on my MacBook, all my photos look fine
-When I connect my external monitor, the photos look too dark.
-I've confirmed that the Color Profile for the monitor is properly calibrated--it's JUST iPhoto
-When I scroll between photos, they momentarily look exactly like they ought to look; but once they've fully loaded, they suddenly become extremely dark again
Any ideas?

No--you evidently didn't understand what I said. As I indicated, EVERYTHING ELSE looks fine on the external monitor. On websites, in other photo apps, in Preview--everything looks exactly the same whether on my internal or external monitor.
It's ONLY in iPhoto that things look messed up. The photos, as they're loading, look correct; as soon as they've fully loaded up, they suddenly become so dark as to be difficult to see--everything else on the screen remains looking exactly the same. And if I drag the window from my external monitor to my internal monitor, the pictures suddenly look okay again.
But, if I view a photo in Preview, it looks the same on both monitors, even as I drag it between the two. So, again, it's ONLY iPhoto.
Incidentally, this is a new problem--as far as I can tell, it only started after installing Mavericks.

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