Apple tv 2 XBMC logo is missing or is black, firmware 5.1 : To Fix copy and paste these commands in terminal to get your XBMC icon back

ssh root@YOUR.ATV2.IP.ADDRESS

cd /var/mobile/Library/Caches/AppleTV/MainMenu

mv com.apple.frontrow.appliance.xbmc\@720 com.apple.frontrow.appliance.xbmc\@720.png

reboot