Sockets not working properly

Hi all. I've developed a simple client/server program using sockets for
sending some characters.

Well, the problem is that everything works perfectly except the last
send/recv pair. If I print the last message received, it displays
nothing. And what's more, the same program running in different computers
behaves different. There're computers where that last message is printed.

I've sniffed the network using ethereal and the data is transmitted in
every case.

Any idea why although the info is really transmitted, it's not received
ok by the program?
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Saludos a todos
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