[LAD] questions about jack session

Hi, What is needed for a working jack session environment? I was hoping to be able to use it with qjackctl-0.3.7 and jack-0.120.1 but this fails to work: 1) When "Save and Quit" is selected and "Save.." has finished, nothing quits. 2) Applications rarely start when a session is loaded and the entries in the session window have red crosses next to them. I need a working jack session environment because I'm trying to code and test Petri-Foo's Jack session support. So far the set session callback returns without error, but the callback is never called (when using the setup mentioned above). I briefly tried pyjacksm but get "inconsistent use of tabs and spaces in indentation" errors (is that because of python3/python2 conflicts arising from scripts starting with #!/usr/bin/python ? I tried adding a sed to the AUR PKGBUILD but failed to find the correct search/replace terms.) Any help appreciated, Cheers, James.