I have dynamic/changing IP address. It changes after every restart/shutdown. I had Libre Office open, when my Mac encountered problem and had to be forced to shut down. I turned it back on, opened Libre Office and got this window titled Libre Office 5.1: "Either another instance of LibreOffice is accessing your personal settings or your personal settings are locked. Simultaneous access can lead to inconsistencies in your personal settings. Before continuing, you should make sure user [insert my user name] closes LibreOffice on host [ip adress and my ISP provider] Do you really want to continue?" First I was scared poopless from seeing words "another instance accessing", but as the IP address displayed resembled one of my own, I performed an experiment. I made snapshot of my current IP adress, then forcibly shut Mac down one more time, turned it on and opened Libre Office to get another one of those windows. I compared IP addresses: The IP address I had before forcibly shutting down was the same the alert window had. So, is it logical to conclude that when LibreOffice is open and Mac is forcibly shut down, it memorizes the IP address Mac had during shut down, then keeps it in memory and when Mac is turned on again with new IP address, Libre Office still holds to that previous IP address? And that the first time it happened, where I couldn't compare IPs, it was the same issue - as I have not encountered this problem ever again after that time. Chance of anything malicious going in should therefore be big fat zero?