Is this problem because of USRP?

hi,
I have encountered some strange problem that I have no idea how to solve
it.
I have attached 3 files which are tx, rx, and loopback codes.(they are
quite
short codes)
tx code using pkt_mod transmits packets.
rx code using pkt_demod receives packets and writes them in a file.
loopback code without using USRP does the same thing.
yesterday I could transmit and receive using tx and rx codes, but now I
run
the code, although there is no error but I can not receive any data.
loopback code is working correctly.(loopback code is pretty similar to
combination of tx and rx codes but without USRP).
now I am really confused why it doesn’t work. Can you have a look to my
codes too see what the problem can be?
do you think can the problem be because of USRP?
http://www.nabble.com/file/p18508233/rx.py rx.py
http://www.nabble.com/file/p18508233/tx.py tx.py
http://www.nabble.com/file/p18508233/loopback.py loopback.py


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