Yellow triangles started appearing in lower right corner of every Aperture photo restored from Time Machine backup
Restored an Aperture 3.6 Library from Time Machine Backup on new iMac with Mojave 10.14.3. All photos restored as expected. But after a while, the photos in the restored Aperture Library had yellow triangles start to appear in the lower right corner. Eventually every photo has the yellow triangle on it.
Unable to export photos from Aperture Library because a message appears to “locate the missing original.” The Aperture Library came from an older iMac with Yosemite OS. There are no yellow triangles on the photos in the Aperture Library on the older computer. The Aperture Library migrates to Photos on the new iMac, with the exception of about 40-50 photos that did not migrate from the Aperture Library.
Has anyone seen the yellow triangle behavior? Any ideas how to fix this?