Can a NO-CD crack affect on-line play

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Hi all : Another quickie so ill get straight to the point. I have battle field 1942 (yes ive used the search ) and its up-dated to the new version but when ever i use the no-cd crack and try to log on to some one who is hosting a game i get "data differs from server" error. I have no probs hosting my own server or in single player mode its only when i want to connect to a server. So i am wondering if the servers i am trying to connect to know i am using a no-cd crack and thats why i get the error message. I have no trouble if i dont use the nocd crack and play through the original disks wich is why i belive it maybe crack related. Anyone else had this problem ? and if you did were you able to sort it without having to use the original exe thus resulting in having to use the original disks. If i was able to make a 1.1 back up would it detect it was a back up when i update the game?. Thanks again for the help guys