I was playing as Franco in a Hotseat situation by myself. Playing it single player seems to let the airdrop happen without a crash, but I hate watching a bazillion moves every turn lol. *edit had uploaded the file after closing the game, which unfortunately had Germany already sack Belgrade and the next paradrop would be substantially later. This one should yield the expected result if loaded in hotseat mode. I tested with a Internet TCP/IP mode to play (Turks and Spanish) by myself to verify, the paradrop does not cause a crash in TCP/IP mode. Seems like it is isolated to hotseat play.