I don't see anyone having mentioned this problem, which is strange, since it's very annoying: the unity icons sometimes blank, and I have to go to the dash thing to see if the program icon is there so i can drag it back, and sometimes it won't drag to where i wan't but will put it at the bottom. I noticed too that cancelled downloads result in ghost icons in Unity. I also noticed that the Wesnoth game icons gave me particular trouble, like after having moved them in via the dash when they failed to show after installation, including the map editor icon, that they AGAIN disappeared. I also noticed HTTrack blanked, and restarting did not reveal it again, I had to go to the dash section. Another annoyance, not a big perhaps, is that a few times Unity would not scroll up when I tried to place an icon upwards, and when it scrolls either way while having an icon grabbed to move it, it is SLOOOOOOW to move. It also seems to have overly fast speed problems when going to the top or bottom, it makes it hard to get to icons in between, it's like an overly sensitive mousepad that responds to every little thing, it's not smart, it's dumb. A few times dupligate icons got stuck on the border, I guess when my trackpad accidentally grabbed icons or trying to move them, though I noticed in Windows 7 this grabbing problem didn't exist, but so when grabbing the actual icon the duplicate would disappear.