One of my biggest problems with iCML is removing of Hearts and Star ratings from tracks. When I first started it was doing this in mass and caused me to quite and give up for a week. I created a Smart Playlist just for the tracks to 'fix' this daly occurrence and have fought it every day since. However with each passing day the number has dropped. Yesterday I had less than 10 tracks with Hearts removed and 1 track with the Stars removed. So far as of today none have been removed.