Tvheadend

When the user adds multiplexes (either by location or manually), tvheadend makes an initial scan on all of them.
There is a counter "Muxes awaiting initial scan" in the GUI that shows how many muxes still have to be scanned.

In my case, this counter never reaches zero by itself : it stops at one (1) value, even after all the muxes have been scanned (based on the debug log)

The main consequence is that the button "Map DVB services to channels" remains grayed (unavailable) : the channels can not be populated.
Restarting tvheadend and/or the system does not help.

The workaround I found was to delete manually one multiplex in the list (through the GUI). This way, the counter reaches zero and I can map my channels.