Tvheadend server problem with autorecs and timers

    First some general info:

    Version running is HTS Tvheadend 4.3-2180 ~ LibreELEC Tvh-addon v12.0.0.3

    Running on an X99 tv box obtained from AliExpress some years ago. It uses Rockchip RK3399.

    Using Hauppauge WinTV-dualHD Dual Tuner (USB), connecting to DVB-T in Auckland, New Zealand.

    Using web interface.

    EPG and doing recordings directly from that works fine. Both single recording and an Autorec.

    But from the Digital Video Recorder, Autorecs menu, when I click the Add button, "Loading, please wait..." pops up briefly, but nothing happens.

    Also from the Digital Video Recorder, Timers menu, when I click the Add button, "Loading, please wait..." pops up briefly, but nothing happens.

    Log shows nothing.

    Any steer on a resolution would be much appreciated.

    BTW, running Tvheadend on a Raapberry Pi4 using the same tuner etc, all works ok.