recently, the file /etc/openhab2/services/runtime.cfg was updated
the last line in there is:
# This setting allows to switch between a "simple" and an "advanced" mode for item management.
# In simple mode (autoLinks=true), links and their according items are automatically created for new Things.
# In advanced mode (autoLinks=false), the user has the full control about which items channels are linked to.
# Existing links will remain untouched. (default is true)
#
org.eclipse.smarthome.links:autoLinks=false
by default, the org.eclipse.smarthome.links:autoLinks is commented out.
As a result, the system will switch to Simple mode.
Changing from PaperUI the mode doesn’t affect this file.
Uncomment the last line and you should be ok.
edit: you are right… there is a bug… the items menu still doesn’t appear even after editing this file.
This looks weird indeed - I didn’t expect that within the cfg files, only on the (internal) *.config files of ConfigAdmin.
Will have to investigate, must be related to the Karaf upgrade, I guess.