Erase free space in this brand new version doesn't allow the option to "zero out" my Macintosh HD like 1.07 did. The "Erase Free Space" button stays inactive when I highlight Macintosh HD. The program does allow me to erase free space of the external hard drive I use with Time Machine. Don't know if it's a bug or not. Are there conditions that Macintosh HD must meet for CCleaner to erase free space?