What we see here, are failure of communication, since some gamers are not at the luxury of using their own language. Jen from Russia, me from Norway, IL from Germany, Massiomo from Italy and so on, and a rule book writen in English.
I know some of you love to switch carriers and trannies as a strategy, and that is good as long as everybody agree on the rules. In my playgroup we have this dude who always buy a carrier in G1, and in G2 send the Med fleet through Suez, and shuck Japan infantry from India to Africa. So UK has an infantry in Italian East Africa, now Japan send a japanese Battleship to shore bombard, and then attack with two japanese infantry from the german tranny and two japanese fighters from the german carrier. The issues often starts when he move in his empty japanese carrier to join, and land two german fighters on it for protection, and later in mid game want to split this fleet, and swith the fighters on the carriers and the men on the trannies, not to mention who owns that AA-gun wich suddenly appered in Africa.
But to be honest, I think this game would be better if not mixing units. I even have issues with UK/US troops landing in Karelia and marching through Sovjet territory, but tthen A&A Europe always was my favorite game