The picture problem seems to be everywhere. It must be some kind of programming bug, like the 'like' thing. I even switched back to the new format to see if they would load. Nope.
I recommend you pass on this guy as well. Too many nice, sound, sane horses out there that need homes, and this guy sounds like a problem in the making. You don't want those-my client has several and they are expen$ive. If you were OK with the arthritis thing, there are plenty of amazing schoolmasters out there that I am sure are veterans on the trail as well. And their arthritis is old age, not some other worrying thing.
"You can do something wrong for thirty years and call yourself experienced, you can do something right for a week and experience more than someone who spent thirty years doing the wrong thing." ~WhattaTroublemaker