So, i think of myself as averagely computer savvy. I know how to use the odd terminal command, set up file sharing, troubleshoot bits and bobs. The strangest thing has happened, however, and i'm looking for some advice. I left my Mac Pro on all day in my apartment - where i live alone - and when i returned, my login picture had changed (from a lion, to lips). The computer was connected to the internet, but not DIRECTLY - it was connected to a public broadband network (the kind that's siphoned off a home user's broadband package and beamed out as a public access network, so basically my neighbour) that needed a login for it to become active (i don't know if this would stop anyone hacking in). It also has a login password on the account (uncrackable), but no filevault. I'm highly perplexed. My main concern is that i've been hacked, and someone has left this as a sort of "calling card". But, no files seem to be altered. Nothing seems to have changed at all. Is this a bug? Can this happen? spontaneous user icon changing? I'm a bit frightened. I have sensitive info on my computer. Any help would be warmly warmly appreciated. This was my first place to think of coming to ask!