Setting Qjackctl to "Enable system tray icon" does not display Qjackctl's icon and the menu provided by qjackctl from systray is blank. Further setting Qjackctl to "Start minimized to system tray" makes the application unusable.
A reboot after Qjackctl to "Enable system tray icon" and "Start minimized to system tray" are set, starting Qjackctl not only doesn't show Qjackctl's icon, but the mouse stops working correctly:
The mouse moves ok, but does not have any hover effect or clicks so the menu no longer works and the only way to kill qjackctl is with control-alt-F1 (which does still work).
Qjackctl is the main application used for controlling Jackd or jackdbus for those using any of the pro audio software.
DistroRelease: Ubuntu 16.04
Package: qjackctl 0.4.1-1ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-4.19-lowlatency 4.4.1
Uname: Linux 4.4.0-4-lowlatency x86_64
Date: Tue Feb 16 14:30:46 2016
InstallationDate: Installed on 2015-11-19 (89 days ago)
InstallationMedia: Ubuntu-Studio 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151118)
UpgradeStatus: No upgrade log present (probably fresh install)