Welcome to the Apple Discussions. Where are these photos located? Open one with Preview and save it as a new jpg image, different name, etc. See if the new image will import. If it does you can download and try this Automator workflow application that I created to convert image files to jpeg and embed the sRGB profile: +*Convert to JPG and Embed sRGB profile*+. You can download if from
Toad's Cellar.
Unzip the application and, as a test, drag a copy of one of the problem files onto it. Then when the process is done import the photo. If all goes well you can process all of your problem files at one time.
OT