Okay, how many images look like this?
the whole session until i changed lenses...



Did you review ALL of the images as you shot?
no-there didn't seem to be a problem


I can't see any EXIF data on the one you've posted, but your 'rescue' is well done!
um... dummy here - not sure how to get that to you

Have you tried shooting some test images to verify the camera's exposure data against the daylight exposure rule?
the rest of the photos from the shoot did not have that problem - i shot about 500 images... side bar statement - they had other issues that were no fault of the camera...uh-hem.

thanks so much for the feedback!