It is version 1.9.22 that is not working. The previous Jack version 
1.9.21 is working fine.
On 26/08/2023 03:59, John Marshall wrote:
 The external USB midi port shows up in the qjackctl graph.
 The midi dongle works fine in other Windows apps. It was also working
 with jack not long ago since then I have upgraded the PC and
 reinstalled Windows.
 Windows version is 10.
 qjackctl messages:
 03:45:32.764 Statistics reset.
 03:45:37.209 JACK is starting...
 03:45:37.210 D:/msys64/ucrt64/bin/jackd.exe -S -X winmme -dportaudio
 03:45:37.281 JACK was started with PID=11604.
 jackdmp 1.9.22
 Copyright 2001-2005 Paul Davis and others.
 Copyright 2004-2016 Grame.
 Copyright 2016-2023 Filipe Coelho.
 jackdmp comes with ABSOLUTELY NO WARRANTY
 This is free software, and you are welcome to redistribute it
 under certain conditions; see the file COPYING for details
 Drivers/internals found in : D:\msys64\ucrt64\lib\jack
 Drivers/internals found in : D:\msys64\ucrt64\lib\jack
 JACK server starting in realtime mode with priority 10
 self-connect-mode is "Don't restrict self connect requests"
 03:45:39.479 JACK connection change.
 03:45:39.483 Server configuration saved to
 "D:\msys64\home\johnm/.jackdrc".
 03:45:39.486 Statistics reset.
 03:45:39.492 Client activated.
 03:45:39.493 Patchbay deactivated.
 03:45:39.519 JACK connection graph change.
 \\ midi keyboard note pressed here
 03:46:24.154 Shutdown notification.
 03:46:24.169 Client deactivated.
 03:46:24.178 JACK is being forced...
 03:46:24.379 JACK was stopped
 .jackdrc:
 D:/msys64/ucrt64/bin/jackd.exe -S -X winmme -dportaudio
 commandline:
 $ qjackctl
 Cannot connect to named pipe after wait =
 \\.\pipe\server_jack_default_0 err = 2
 Cannot connect to server request channel
 jack server is not running or cannot be started
 JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1,
 skipping unlock
 JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1,
 skipping unlock
 Cannot connect to named pipe after wait =
 \\.\pipe\server_jack_default_0 err = 2
 Cannot connect to server request channel
 jack server is not running or cannot be started
 JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1,
 skipping unlock
 JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1,
 skipping unlock
 \\ midi keyboard note pressed here
 CheckRes error
 JackWinNamedPipeClientChannel read fail
 Server is not running
 Server is not running
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