rednet.receive only returning 0

I am very new to computercraft, and I was experimenting with simple modem send and receive programs. I wanted to make a program that could wirelessly send text to another computer which would display it on a monitor, but I noticed that no matter what I sent, rednet.receive would always return 0. I am 100% sure that I did not mess up the id's on the computers and that all the modems were properly opened. I know they are connected because the receiving computer waits until the text is sent and then returns 0, no matter what the sent text was. Can someone help me?

Please post your code. You're probably not realizing that the first return value of rednet.receive is the ID of the sending computer.

Sorry, I forgot.
Sending code:

Rednet.open("back")
Msg = io.read()
Rednet.send(22, msg)

Receiving code:

Rednet.open("back")
Local msg = rednet.receive()
Write(msg) --I downgraded it to write() because I was having unrelated problems with the monitor

As I said, the first return value from rednet.receive() is the ID of the sending computer. Try catching the ID as well as the message and you'll have better luck:

rednet.open("back")
local id, msg = rednet.receive() --# note the use of id as well as message to catch the appropriate return values.
write(msg)

Thanks so much, I hope this works!