Hi BusyShadows, Since CC4.6 does not support content with data added in CC5.0, please make sure the files you are using were downloaded from a version prior to CC4.6 and have not been re-saved in IC8.6 or CC5.0 (ensure the files are from the older version). If you are certain your files are from before CC4.6 but the issue persists, please provide the problematic files for us to check. Please upload it to a cloud drive (like Google Drive) and reply with the download link. You can set the link as private if you'd prefer. Thank you. Tina