Cannot import from iPad (in any application)

Question

We can no longer import photos from my wife's iPad from iPhoto, Aperture or Image Capture. I've tried on two different computers, one running the most recent version of Mountain Lion, the other Mavericks with the most recent updates to Aperture and iPhoto. She usually uses iPhoto (pre-Mavericks release) on a iMac running Mountain Lion, but the issue is exactly the same on either computer, across all 3 applications so we have narrowed the issue down to the iPad, not Mac preferences or application issues.
Status:
iTunes - There are 468 photos as indicated in iTunes; all other SW udpates and syncing seems to work.
iPhoto - Permanently stuck on "loading", same issue on both computers, both versions of iPhoto. See screenshot.
Aperture - iPad shows ups, photos never load, never able to import. See screenshot
Image Capture - Same as above. See screenshot.
Steps taken on 1 or both machines
Updating iPad from iOS 7 to 7.0.3, no change (we think issue began before iOS 7 but cannot verify).
Updated Mountain Lion to most recent version on iMac, no change.
Created new libraries on both computers, no change.
Too many restarts of iPad and computers to count.
Any help would be greatly appreciated. We are heading on vacation in the morning and my wife was hoping to use the iPad to store photos from her camera.
Thanks,
- cluv

Answer 1

I use a Canon LiDE 110 scanner with the same problem.
After scanning, the PDF file appears on the desktop, but when I open it with Preview, the document is blank.
However, I can open it with Adobe Reader just fine.