@Len, I could not reproduce it on my own system with Xfce installed, but
I can now reproduce it on Xubuntu daily CD.
According to D-Bus monitor, qjackctl doesn't even create a tray icon
before everything hangs.
Looking at the code, I suppose such behavior may be a result of this
call in src/qjackctl.cpp:
XGrabServer(m_pDisplay);
m_wOwner = m_pWidget->winId();
XSetSelectionOwner(m_pDisplay, m_aUnique, m_wOwner, CurrentTime);
In this code, m_pWidget is hidden so has no winId, and calling
XSetSelectionOwner with m_wOwner=0 may result in blocked X11 session.
(Because of bad design of X11, apps can do that… In Wayland this isn't
possible).
I very much recommend to not use X11 API directly in Qt applications,
and use what Qt provides instead.
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https://bugs.launchpad.net/bugs/1546328
Title:
Systray option does not work.
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