Hi Atkinsgj,
I found the correct bug. This is listed as fixed in 8.1, but was very hard to reproduce. Obviously, it is raising its ugly head again.
Engineering has asked me to ask those having the issue to see if temporarily moving the related XMP sidecar files to a separate folder helps restore the clips. If so, can you please upload those files with the related side cars so we can test with them?
Thanks,
Kevin