Hi, can you be a bit more explicit? I presume that this is also Diplomacy Remastered? Where are you trying to change the name? On the unit it's self in the unit info window, where it says "Click to change name of unit", or the TOE button on the tool bar, where it says "click to change the model of this unit"? Note that with a TOE assigned you can only change the short name in the TOE window. It might be best to send me a save game with explicit instructions on what causes the problem, which I also presume is a CTD.
One man alone can be pretty dumb sometimes, but for real bona fide stupidity, there ain't nothin' can beat teamwork -- Edward Abbey