So tuckerkao, you have seen this before and think it is the game itself, the servers and that the icons will come and go? This appears to be the case. As of this am icons are missing again. As noted this is the first time since I started a few months ago that I have run into this. As seen they did just make changes to the city layouts and as you note this could be some of that game updating process, makes a lot of sense. As I said before once in a large city it makes it much easier to locate GBs that could be contributed to and know which were leveled up because icon was not there. Thanks