Tvheadend

Hi,
I used TVhat on raspberry to record TV channels. It worked fine.

But now, as soon I try to set up a record request, everything disappears : no more TV channels, no more TV guide from the raspberry.
AS a process, tvheadend is still running, and the connection to IP:9981 shows all channels on the PC.

If I install again tvheadend I have the TV channels, the TV guide, but trying to set up a record leads to the above described situation.

Thanks for your help