In Windows 7 Explorer, dbPoweramp offers a context menu to modify id-tags. When I change the genre field on a .mp3 file, sometimes the change doesn't appear in either Explorer or in the Audacity metadata editor (they show the genre field as empty, and so does the Sonos music library), though the dbpoweramp menu thinks the change has taken place when I go back to it. Rebooting Windows had no effect. It's intermittent between files; in one case one track ripped from a CD was OK and all the others had this problem. Using a genre (like "Ambient") instead of one I created (like "Night") seems to be a workaround, but I'd like to fix the problem if I can. Any ideas?