Selecting the yellow-green flag icon in MusicMaster's replacement song window in the Schedule Editor lets you hide songs that fail an unbreakable rule.  If you select the green flag icon, you'll only see "perfect" songs, or those that pass all of the rules.  Using these always causes the replacement song window to take a lot longer to open.  That's because, in addition to sorting the potential replacement songs by rest, MusicMaster has to also perform all the tests for each song to make sure it qualifies for display.  The extra loading time may be worth the wait, since you're now presented with a list of better replacement candidates, meaning you won't have to dig past a bunch of songs that you can't use.  However, you can make this process go faster by changing a setting in Tools, Options, Additional Properties.  Find the line that says "MoreDigDepth" and make that a smaller number.  The default is ten, but you'll get much better performance if you set it to three.  This limits the number of songs that MusicMaster will display when opening the replacement song window when these "perfect song" flag icons are being used.  If you set it to three, MusicMaster will stop after it has found the three most-rested "perfect" songs.  If it has not finished searching through and testing all the songs, a "More" button will appear.  Clicking on this button tells MusicMaster to find three more "pefect" songs to display.  Usually, you can find an ideal replacement song in the first three displayed.  If you really want to pour on the speed, consider using the new Shift-F9 hot key. This replaces the current element with the best testing song found without even opening the replacement song window. That can save a lot of editing time, and it usually gives you a song that works perfectly in that spot!