When there is no signal in the any channel the channel disappear automatically from the list channels in ProgDVB. why !!!!!!!!!!!

Most likely you have enabled the Auto update channels list from the options dialog.

Did you mean I must disable that option !!!!!

yes, if you do not want to have the channels deleted when there is no signal

ok, i will do it

Auto disappearing is a bad idea, as temporary stations may exist without a place holder, though returning frequently.

But regional stations quite often change streams for local transmissions, so auto update may be a must, to view your local transmissions.
There are lots of examples for this on German TV on Astra 19.2E , like various NDR and WDR stations.

So, automatic changing of streams is mandatory, but auto delete is not.
Stations should only get deleted after a scan, and only if user confirmed (each).

In order to clarify this: there are two settings available in ProgDVB
1. Auto update channel parameters - which does what the name says...updates the channel properties.
2. Auto update channels list - automatically adds new channels and deletes them when are not available any more. This is valid when going to a channel from that transponder.

So, if he wants the only channel parameters to be updated the first option must be enabled. This is the default setup in ProgDVB. It is the user option to enable the second one.

Maybe a delete confirmation dialog would be required ifor the deletion. Maybe the user doesn't want this channels being deleted although he enabled the option...

You are right.

For technical reasons, I am mainly using pretty old versions of ProgDVB, until my coming up new machine will be complete.
So I had not yet noticed that changes

Hope this will change within the next couple of days...

It works fine now after disabling that option