By the way, I remembered another detail: YESTERDAY, I STARTED PLAYING A CAMPAIGN AND PRESSED "SAVE," AND IT SEEMED TO SAVE, AND THEN I PRESSED "LOAD." AND OH MY GOD, THE GAME DIDN'T CRASH! HOORAY! BUT THEN I RECEIVED A MESSAGE ON ODNOKLASSNIKI AND MINIMIZED THE GAME. AND I SAW THAT UPLAY WAS ALREADY DOWN.
I went back to Heroes. I clicked "save," and THAT'S IT: THE SAVE WINDOWS ARE INACTIVE, AND THE SAME THING HAPPENS IN "LOAD." AUTO-SAVE DOESN'T WORK!
Guys! At least we've gotten closer to solving the problem!