In scripting you can check for the flipped state of a frame or image in InDesign but not in Photoshop, so if it's the  image file that's wrong reading I think you're out of luck.

This sets the flip of every link and its frame to none. Note that the flip is relative to the Transform Panel's Reference Point

tell application "Adobe InDesign CS5.5"

          tell active document

                    set IDLinks to links

                    repeat with myCounter from 1 to count IDLinks

                              set absolute flip of parent of item myCounter of IDLinks to none

                              set absolute flip of parent of parent of item myCounter of IDLinks to none

                    end repeat

          end tell

end tell

Rob I am having a lot of trouble getting this to work. I'm using CS4, would this be problem? I've saved the file as a .jsx and put into scripts but it gives me an error code 25, telling me it has found offending text, that being the first word of the first line. I only have started looking into scripts so I'm not sure how to fix this.

Intriguing, but the original question was about checking for flipped images, not "fixing" them. I would be pretty upset if I flipped an image on purpose and someone "fixed" it back again. And in some cases (such as when the image is flipped and then also cropped), the result of removing the flip could be disasterous.

There ought to be a way to do this in the Preflight panel, but I don't think there is. But a way to check for it as a preflight process would be terrific, providing a list of instances, with links to them, etc.

(And of course, it being javascript so that Windows users could use it, too, would be even better.)

Yes David I do get upset when I find my layouts and templates with flipped images, a script would save my temper!