To see the Bug Report: https://sourceforge.net/tracker/?func=detail&atid=104932&aid=352737… The answer from Rosegarden: *The backtrace seems like it agrees with what you describe. ladspa_guitarix.so was doing some glibmm call which in turn called into glib. Looks like g_private_replace() decided to abort(). So it may be that glib/glibmm was updated on your system and there's a bug in one of those. I would try to fix it by first building and installing the latest guitarix from sourceforge. If that doesn't work, try building and installing the latest glib/glibmm. Might be tricky, though. Can you go back to the older versions that worked? **Reporting this to your distro might also be helpful. They might already be aware of a problem with one of their patches. * Most of audio programs in arch-linux (I think its the same at other distros*) were provided from the community, here AUR. This is in one hand positiveand innovative.But it brings on the other side instability, like in our case and we are in a production. My questions are how can i find older versions of this programs (glib/glibmm/guitarix) until the bug is fixed or how I can handle in future a "last best system" ? *Thanks a lot, Yosef