Re: packets not being decoded in gnuradio 3.6 but was decoded in 3.4 and 3.5

Hello all,
I have figured out that the code gets stuck at line 275 of the code
attached thus;
msg = self.rcvd_pktq.delete_head()
Can anyone tell me which module is implementing the received message
queue and any ideas on why it will be empty apart from received
frequency not aligned to transmit frequency?

Henry