Test 800 x 600 (it started out too small to expand to 1024 x 768 without becoming fuzzy).
It might be that your camera settings got "bumped". It happened to me. When you first download
them what does their file size show?
OK I just saved the grille pictures from page 15 they were 800 x 537 now that I posted them here without changing anything the go to the same size the others 500 x 334 my camera wasn't even involved and I got a new camera for XMas and this happened before the camera change.