ID 422. Video-metadata column display fields no longer appearing after updating Icaros shell extensions to 3.3.3 final. Furthermore, when these columns were previously visible, metadata in them not loading entirely on connected external back-up hard drive: just a spinning circle shown in the drop-down location bar. No issues with prior Opus versions. Unsure exactly when such issues began occurring. Sorry; can't currently be any more precise.
Restoring a backup restored the columns' display fields again. Strange. I recall having to do this previously to fix the issue.