Ran the debug session as requested. Some comments: At 00:21:29 I executed "syncevolution --quiet --print-config memotoo" in another window At 00:22:57 I executed "sync-ui" in another terminal, and exited the GUI a couple of seconds later. After control was initially returned to gdb, the process was still not dead, as evidenced by "ps" in another window. I issued "contiune" to gdb, after which it eventually died. I notice that the daemon complains about the source "autosyncinterval=10m". This source appeared in the config file as a section [autosyncinterval=10m] after earlier today I had executed both: $ syncevolution --configure memotoo autoSyncInterval=10M $ syncevolution --configure autoSyncInterval=10M memotoo in attempts to learn to set that interval. Could that be relevant? How can I safely get rid of it (manually editing files under .config/syncevolution seems unsafe to me)?