Hummmm; it appears that x2goclient sessions are still not being purged successfully. The first two lines below are a connection attempt while loglevel is "notice"; changing loglevel to "info" immediately began producing info including repeated calls to x2gosuspend-session and x2goumount for the same two sessions on displays 52 and 55...
loglevel = notice:
May 23 16:33:52 destiny /usr/bin/x2gostartagent: successfully started X2Go agent session with ID mikem-55-1495582428_stRPUBLISHED_dp24 May 23 16:34:45 destiny /usr/bin/*x2gosuspend-session*: session with ID mikem-55-1495582428_stRPUBLISHED_dp24 has been suspended successfully
loglevel change = info
May 23 16:35:05 destiny /usr/bin/*x2gosuspend-session*:*x2gosuspend-session* called with options: mikem-52-1495577325_stRPUBLISHED_dp24 May 23 16:35:06 destiny /usr/bin/x2gosuspend-session: x2gosuspend-session called with options: mikem-55-1495582428_stRPUBLISHED_dp24 May 23 16:35:06 destiny /usr/bin/x2gofeature: x2gofeature called with options: X2GO_DESKTOPSHARING May 23 16:35:06 destiny /usr/share/x2go/x2gofeature.d/x2goserver-extensions.features: x2goserver-extensions.features called with options: X2GO_DESKTOPSHARING May 23 16:35:06 destiny /usr/share/x2go/x2gofeature.d/x2goserver.features: x2goserver.features called with options: X2GO_DESKTOPSHARING May 23 16:35:06 destiny /usr/share/x2go/x2gofeature.d/x2goserver-printing.features: x2goserver-printing.features called with options: X2GO_DESKTOPSHARING May 23 16:35:07 destiny /usr/share/x2go/x2gofeature.d/x2goserver-xsession.features: x2goserver-xsession.features called with options: X2GO_DESKTOPSHARING May 23 16:35:07 destiny /usr/bin/x2gofeature: x2gofeature called with options: X2GO_DESKTOPSHARING May 23 16:35:07 destiny /usr/share/x2go/x2gofeature.d/x2goserver-extensions.features: x2goserver-extensions.features called with options: X2GO_DESKTOPSHARING May 23 16:35:07 destiny /usr/bin/x2gofeature: x2gofeature called with options: X2GO_RUN_EXTENSIONS May 23 16:35:07 destiny /usr/share/x2go/x2gofeature.d/x2goserver.features: x2goserver.features called with options: X2GO_DESKTOPSHARING May 23 16:35:07 destiny /usr/share/x2go/x2gofeature.d/x2goserver-extensions.features: x2goserver-extensions.features called with options: X2GO_RUN_EXTENSIONS May 23 16:35:07 destiny /usr/share/x2go/x2gofeature.d/x2goserver-printing.features: x2goserver-printing.features called with options: X2GO_DESKTOPSHARING May 23 16:35:07 destiny /usr/bin/x2goserver-run-extensions: x2goserver-run-extensions called with options: mikem-52-1495577325_stRPUBLISHED_dp24 pre-suspend May 23 16:35:08 destiny /usr/share/x2go/x2gofeature.d/x2goserver-xsession.features: x2goserver-xsession.features called with options: X2GO_DESKTOPSHARING May 23 16:35:08 destiny /usr/bin/x2goumount-session[20811]: x2goumount-session has been called with options: mikem-52-1495577325_stRPUBLISHED_dp24 May 23 16:35:08 destiny /usr/bin/x2gofeature: x2gofeature called with options: X2GO_RUN_EXTENSIONS May 23 16:35:08 destiny /usr/bin/*x2gosuspend-session*: x2gosuspend-session called with options: mikem-52-1495576959_stRPUBLISHED_dp24 May 23 16:35:08 destiny /usr/share/x2go/x2gofeature.d/x2goserver-extensions.features: x2goserver-extensions.features called with options: X2GO_RUN_EXTENSIONS May 23 16:35:08 destiny /usr/bin/x2goserver-run-extensions: x2goserver-run-extensions called with options: mikem-55-1495582428_stRPUBLISHED_dp24 pre-suspend May 23 16:35:09 destiny /usr/bin/x2gofeature: x2gofeature called with options: X2GO_DESKTOPSHARING May 23 16:35:09 destiny /usr/bin/x2goumount-session[20897]: x2goumount-session has been called with options: mikem-55-1495582428_stRPUBLISHED_dp24 May 23 16:35:09 destiny /usr/share/x2go/x2gofeature.d/x2goserver-extensions.features: x2goserver-extensions.features called with options: X2GO_DESKTOPSHARING May 23 16:35:09 destiny /usr/share/x2go/x2gofeature.d/x2goserver.features: x2goserver.features called with options: X2GO_DESKTOPSHARING May 23 16:35:09 destiny /usr/share/x2go/x2gofeature.d/x2goserver-printing.features: x2goserver-printing.features called with options: X2GO_DESKTOPSHARING May 23 16:35:10 destiny /usr/share/x2go/x2gofeature.d/x2goserver-xsession.features: x2goserver-xsession.features called with options: X2GO_DESKTOPSHARING May 23 16:35:10 destiny /usr/bin/x2gofeature: x2gofeature called with options: X2GO_RUN_EXTENSIONS May 23 16:35:10 destiny /usr/share/x2go/x2gofeature.d/x2goserver-extensions.features: x2goserver-extensions.features called with options: X2GO_RUN_EXTENSIONS May 23 16:35:10 destiny /usr/bin/x2goserver-run-extensions: x2goserver-run-extensions called with options: mikem-52-1495576959_stRPUBLISHED_dp24 pre-suspend May 23 16:35:11 destiny /usr/bin/x2goumount-session[21019]: x2goumount-session has been called with options: mikem-52-1495576959_stRPUBLISHED_dp24