Cached thumbnails not displaying

  • A folder with hundreds of images in already converted to thumbnails and cached previously
  • folder is in a tab in thumbnails view
  • when I go to tab to pick an image all looks okay
  • type in a quickfilter and more often than not some of the filtered thumbnails will be just showing the enlarged default image icon and not the image thumbnail that has been cached already
  • clicking details view and then back to thumbnails view fixes the problem