I did a reinstall and the only way I found to emulate your problem of it not starting in the message log is by not opening Jack NetDriver prior to the Jack Control. You may just want to reinstall and keep a tab on the changes you did (assuming you haven’t done this already).
Other than that I can’t change individual settings sample rate/buffer time. I’ve tried in the shortcut and from Jack Control shortcut but it still stays at default, maybe you guys had better luck there. I have some more tinkering to do I suppose.
Edit: Got it to work so I’ll post the steps/settings since its fairly finicky.
Uninstalled and reinstalled in full as well as unregistering and reregistering the server in cmd.
Before opening Jack control:
-In the Jack PortAudio shortcut in the target: “Your install directory\jackd.exe” -R -S -d portaudio -d “ASIO::Your driver” -r samplerate -p bufferrate
-Go to JackRouter config file in 32bits and 64bits edit those you your liking. I did both but they may not need to.
[IO]
Input=number input channels you want
Output=number output channels you want
float-sample=0
[Auto_Connect]
input=1
output=1
alias=1
-Opened Jack Port Audio
-Opened Jack Control
In Jack Control my settings that portaudio allow
Server Prefix: jackd -S
Name: default
Driver: portaudio
Realtime: check
Interface: default
Frames: 256
Dither: None
Sample Rate: 48000
Audio: Duplex
Input: Default
Output: Default
Channels:24
Channels I/O: 12,12
Port Maximum: 256
Latency I/O: Default,Default
Under Display Tab
Transport Time Code
Enable client/port aliases: check
Enable client/port aliases editing: check
Jack client/port aliases: Changed to Default from second
Misc Tab
Start JACK audio server on application startup: check
Stop JACK audio Server on application exit: check
Save JACK audio server configuration to: .jackdrc
Confirm server shutdown: check
Hopefully this can help you out. This is just my routing of Traktor to Ableton but I’m sure your connections shouldn’t pose that much of a problem.