Is this a single render with a spherical camera, or multiple images stitched together? If it's multiple images stitched together, it looks like it's not reading the same cache file for every image. Check that there is only 1 cache file in the folder. That cache file should have been generated with a single render with a spherical camera. If you're using some automated tiling system then it might be creating a separate cache for each tile, which won't work.
Another possibility is there might be a cloud layer with "Acceleration Cache", but this is an older feature that's been removed from recent versions because of problems like this.