Tvheadend server problem with autorecs and timers

First some general info:

Version running is HTS Tvheadend 4.3-2180 ~ LibreELEC Tvh-addon v21.2.3

Running on an X88 King tv box obtained from AliExpress some years ago. It uses Amlogic S922X.

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 Raspberry Pi4 using the same tuner etc, all works ok.

Aged Tanix Tx3 mini-A box

CoreELEC (official): 21.2-Omega (Amlogic-ng.arm)
Machine model: Amlogic
CoreELEC dt-id: gxl_p281_2g
Amlogic dt-id: gxl_p281_2g
Linux version: 4.9.269 (portisch@ubuntu) #1 Sun Jan 19 10:25:02 CET 2025
Kodi compiled: 2025-01-19 09:39:20 +0000

TVHeadend:

Build: 4.3-2180 ~ LibreELEC Tvh-addon v21.1.1.0 (2024-05-12T09:51:27+0300)

Same events, but do not know how long it has been like this as I have not had occasion to use those functions.