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Disabling jackdbus had no effect.
There have been some "couldn't connect to client" messages, I think...
I have Ubuntu Studio 16.04 with the kxstudio repos bound in. It has been the kxstudio version. Maybe that was the point.
Uninstalled the kx version and tried to compile 0.4.5 from the sources. No success. Probably because of the dependencies. There were some ugly looking "no's" when I did ./configure:

checking for qmake-qt5... no
checking for ALSA... no
configure: WARNING: *** ALSA library not found.
checking for PORTAUDIO... no
configure: WARNING: *** PORTAUDIO library not found.
checking CoreAudio/CoreAudio.h usability... no
checking CoreAudio/CoreAudio.h presence... no
checking for CoreAudio/CoreAudio.h... no
checking for QT5X11EXTRAS... no
JACK Version support (JACK2) . . . . . . . . . . .: no
ALSA MIDI Sequencer support . . . . . . . . . . .: no
PortAudio interface support . . . . . . . . . . .: no
CoreAudio interface support . . . . . . . . . . .: no
X11 Unique/Single instance . . . . . . . . . . . .: no
Debugger stack-trace (gdb) . . . . . . . . . . . .: no

I gave up this, started Synaptic and forced the installation of Ubuntu Qjackctl 0.4.2 which worked fine (including Portaudio, Pulseaudio and a2jmidid script).
I know it's poor, but that's Ok for me :-)

Thanx and kind regards from Hamburg,
borla