I have been having this very strange issue with the tactics section where I will create a play, save it, and it will all look good, then if I go off to do something else in the game, I will come back to tactics to find the play deleted. This issue only seems to be happening on NEW formations that I have created using 0.9.1, if I try to make a play with any of the default formations or any formations I had previously created, they will save.
I wonder if it might be possible that my issue came from the way I transferred my old plays into 0.9.1 when I downloaded it. Instead of using the "Import Play" button in tactics, I simply copied all of my old plays from the old export file into the new plays file, and copied the old formations into the new formations file as well. All of those plays seem to have transferred over fine, but is it possible that by doing that I messed up the system that allows plays to be created?