Unfortunately a software bug has been introduced in the TDX / TDH software ver. 18.104.22.168682
Basically it relates to the "submit button" not being active when doing changes/modifications to a CA configuration (selecting non audio/video pids to be descrambled).
The workaround is to select and de-select an extra service. This will activate the submit button.
See this video on HowTo do this: