Hi, I have been having this problem for quite some time. My IT folks have upgrade my Microsoft office to 2016... however, the problem still happens. Randomly when I copy a cell the boarder no longer appears... I have found this to be an indicator that my excel is going to crash --- or "stop working" I would like to figure out the root cause of this, so that I can fix the problem. My work around is when the marching ants stop appearing I will close all of my spreadsheets and reopen them... this will avoid any loss of data. I do have the auto save-but, still I would like for Excel to stop crashing... this issue happens multiple times a day... help!