Whenever I load saved games, FleetOps crashes. I thought this was a bug that was fixed with 3.1.1 but I wanted to double check and post an error report (some personalized info deleted).
Also, interestingly, I have discovered that this happens when loading a game in which the player was playing the Feds more often than some of the other races. I don't know if this is a consequence of the number of units, or just an interesting coincidence.
this is a bug i haven't figured out entirely yet and exists since 3.0.0. you may be right with your assumption about the federation race crashing more often. i have received several savegames from users experiencing the same crash. i just haven't had the time yet to investigate this problem further. thanks for your report