Vertical thumbnails and previews corrupted.

Many of my vertically formatted pictures suddenly started displaying the correct picture rotated 90 degrees at the top half of the vertical frame with another seemingly random picture or sometime just a black background in the lower half of the frame.

If I open on of the affected pictures they appear to be fine.

I have:

Generated Thumbnails

Updated Previews

Run Repair Database

Run Rebuild Database

Not sure what to try next.

Thanks for any suggestions,

George

Aperture 3.6

Yosemite 10.10.5