Workaround. Delete the active playlist and re-create it. Now all videos with keywords (that didn't display before) display properly. Glitch I guess. Though system task is now stuck saying processing active playlist whereas it used to just quickly fly through that. Closed Mezzmo, restarted it. Now the status is clear. So that was just probably an anomaly also.
....and thank you for displaying keyword in the properties pane - that helps allot as I start this process :-)
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