Andrew!
Try thisif you 'aven't already)
Take one of those recalcitant jpg images and just save it using something like Fastone Viewer.
Do nothing else to that file .. no edits .. no nutt'n!
Just save it (with whatever compression ratio you see fit .. I don't think it'll matter)
So if IAM_7011 doesn't get recognised by the i(nfuriating)Pad now .. just use any other software(FSViewer, or Paintdotnet or even something as silly as M$'s Paint!!) .. just use another software to save that jpg again.
If that doesn't work .. use the axe!