This I have found with "7d2" in the logs:
Pre-Update (still on 3.1.4):
./2016_04_06.stderrout.log:[2016-04-07 00:25:35] INFO com.normation.inventory.provisioning.endpoint.FusionReportEndpoint - New input inventory: 'servername-7d28f523-c0ea-45c1-88a7-ad2f342e09e4.ocs'
./2016_04_06.stderrout.log:[2016-04-07 00:25:37] INFO com.normation.inventory.provisioning.endpoint.FusionReportEndpoint - Inventory 'servername-7d28f523-c0ea-45c1-88a7-ad2f342e09e4.ocs' parsed in 1 second and 217 milliseconds, now checking signature
./2016_04_07.stderrout.log:[2016-04-08 00:25:45] INFO com.normation.inventory.provisioning.endpoint.FusionReportEndpoint - New input inventory: 'servername-7d28f523-c0ea-45c1-88a7-ad2f342e09e4.ocs'
./2016_04_07.stderrout.log:[2016-04-08 00:25:46] INFO com.normation.inventory.provisioning.endpoint.FusionReportEndpoint - Inventory 'servername-7d28f523-c0ea-45c1-88a7-ad2f342e09e4.ocs' parsed in 915 milliseconds, now checking signature
./2016_04_08.stderrout.log.095050642:[2016-04-08 11:45:05] INFO com.normation.rudder.services.policies.nodeconfig.NodeConfigurationServiceImpl - Configuration of following nodes were updated, their promises are going to be written: [e37f6a1c-b9fb-4255-bc7a-02bd30b3287e, cb82f211-cbf0-4bb0-8059-1c2776432e76, 7d28f523-c0ea-45c1-88a7-ad2f342e09e4, 296ab77f-19da-4e28-9b72-fbaceefdfc2d, root, 996295be-71e7-4b3e-9f00-d058b0529c14]
./2016_04_08.stderrout.log.095050642:[2016-04-08 11:45:16] INFO com.normation.rudder.services.policies.nodeconfig.NodeConfigurationServiceImpl - Configuration of following nodes were updated, their promises are going to be written: [e37f6a1c-b9fb-4255-bc7a-02bd30b3287e, cb82f211-cbf0-4bb0-8059-1c2776432e76, 7d28f523-c0ea-45c1-88a7-ad2f342e09e4, 296ab77f-19da-4e28-9b72-fbaceefdfc2d, root, 996295be-71e7-4b3e-9f00-d058b0529c14]
./2016_04_08.stderrout.log.095050642:[2016-04-08 11:45:23] INFO com.normation.rudder.services.policies.nodeconfig.NodeConfigurationServiceImpl - Configuration of following nodes were updated, their promises are going to be written: [e37f6a1c-b9fb-4255-bc7a-02bd30b3287e, cb82f211-cbf0-4bb0-8059-1c2776432e76, 7d28f523-c0ea-45c1-88a7-ad2f342e09e4, 296ab77f-19da-4e28-9b72-fbaceefdfc2d, root, 996295be-71e7-4b3e-9f00-d058b0529c14]
./2016_04_08.stderrout.log.095050642:/bin/chmod: cannot access `/var/rudder/share/7d28f523-c0ea-45c1-88a7-ad2f342e09e4/rules.new/cfengine-community': No such file or directory
Post-Update (on 3.1.8):
./2016_04_08.stderrout.log:Near: 7d2
./2016_04_08.stderrout.log:Near: 7d2
This 'servername' with the GUID '7d28f523-c0ea-45c1-88a7-ad2f342e09e4' is also the node I clicked on the GUI.
After clicking again, it did not behave this way and loaded the page for that node.