I just faced the same issue. (fresh raspian stretch, pd 0.47.1)

#!/bin/bash
pd -nogui -alsamidi -midiindev 1 -midioutdev 1 /home/pi/midi-thru1.pd &
sleep 2
aconnect 20 'Pure Data:0'

solved it.

it's a canvas on top.
try ctr-e and move it, move it

Hi,
you can send a '/live/undo' to live via OSC using the liveOSC midi remote script.

open the sub-patch and right click to choose "graph on parent"

cheers
gop-demo.pd

Hi,
first device channel 1-16
second device channel 17-32 ...
and so on, no bug here I think.

that sounds nice: pisound

you need to save your patch as well when you're finished.

on windows it looks like this:

nice little (free) book about audio processing on Windows mashines:
https://www.cantabilesoftware.com/glitchfree/?utm_source=mailinglist&utm_med
have fun!

this time the patch looks like your screenshot. It seems like you have two parts of your patch.