Syslog has a few obvious failures for snapd related to the fact that the snaps did not mount correctly.

zyga@zyga-thinkpad-w510:~$ journalctl -u snapd
-- Logs begin at wto 2016-04-19 14:52:46 CEST, end at wto 2016-04-19 15:09:43 CEST. --
kwi 19 14:55:39 zyga-thinkpad-w510 systemd[1]: Started Snappy daemon.
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: snapstate.go:374: cannot retrieve info for snap "hello-world": cannot find mounted snap "hello-world" at revisi
kwi 19 14:55:44 zyga-thinkpad-w510 snapd[3780]: 2016/04/19 14:55:44.026609 snapstate.go:374: cannot retrieve info for snap "hello-world": cannot find mounted snap "hello-worl
kwi 19 14:55:44 zyga-thinkpad-w510 snapd[3780]: 2016/04/19 14:55:44.026701 snapstate.go:374: cannot retrieve info for snap "links": cannot find mounted snap "links" at revisi
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: snapstate.go:374: cannot retrieve info for snap "links": cannot find mounted snap "links" at revision 1
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: ifacemgr.go:134: cannot connect plug "unity7" from snap "hello-unity", no such plug
kwi 19 14:55:44 zyga-thinkpad-w510 snapd[3780]: 2016/04/19 14:55:44.087397 ifacemgr.go:134: cannot connect plug "unity7" from snap "hello-unity", no such plug
kwi 19 14:55:44 zyga-thinkpad-w510 snapd[3780]: 2016/04/19 14:55:44.087447 ifacemgr.go:134: cannot connect plug "network" from snap "links", no such plug
kwi 19 14:55:44 zyga-thinkpad-w510 snapd[3780]: 2016/04/19 14:55:44.087488 ifacemgr.go:134: cannot connect plug "network-bind" from snap "links", no such plug
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: ifacemgr.go:134: cannot connect plug "network" from snap "links", no such plug
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: ifacemgr.go:134: cannot connect plug "network-bind" from snap "links", no such plug
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /v2/system-info
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /v2/login
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /v2/logout
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /v2/icons/{name}/icon
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /v2/snaps
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /v2/snaps/{name}
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /v2/interfaces
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /v2/assertions
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /v2/assertions/{assertType}
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /v2/events
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /v2/changes/{id}
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:202: DEBUG: adding /v2/changes
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:192: DEBUG: init done in 1.048854ms
kwi 19 14:55:44 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:170: DEBUG: uid=1000;@ GET /v2/snaps?sources=local 146.449673ms 200
kwi 19 14:58:04 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:170: DEBUG: uid=1000;@ GET /v2/snaps?q=polari 729.704955ms 200
kwi 19 14:58:30 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:170: DEBUG: uid=1000;@ GET /v2/snaps?q=firefox 649.339281ms 200
kwi 19 14:58:30 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:170: DEBUG: uid=1000;@ GET /v2/snaps?q=firefo 972.39257ms 200
kwi 19 15:03:31 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:170: DEBUG: uid=1000;@ GET /v2/snaps?sources=local 556.543µs 200
kwi 19 15:07:42 zyga-thinkpad-w510 /usr/lib/snapd/snapd[3780]: daemon.go:170: DEBUG: uid=1000;@ GET /v2/interfaces 360.746µs 200