[Discuss-gnuradio] Packet Encoder-Decoder

Hi,
In the followning basic setup:

File Source (Byte) ----> Packet Encoder (Byte) -----> File Sink (byte)

My input file is just a "Hello World" message

If the Repeat property of my file source is set to "No" the File Sink remains empty Why? Do I have buffering issues?

If I set Repeat="yes" file sink seems to work, But when I insert a Packet Decoder:

File Source ----> Packet Encoder ----->Packet Decoder -----> File Sink

The output file is empty again!

Thanks