Yes, I check samples. Some channel total without subtitles, some with real problem. But now I am not have good idea about bad chars in teletext. Do you have some information about specific of subtitles of this provider?

All channels which I sent you, did have subtitles at the moment when I recorded them - I've seen it at normal TV.

Unfortunately I don't know where to get more subtitle informations.
I only can give you the www pages of these channels:
www.ard.de
www.zdf.de

Could you please explain me how to manually input the videotext page number in ProgDVB - perhaps it helps?

Channel properties->Edit subtitles->Add

There is no "edit subtitles":

Second "edit" button near empty combobox with subtitles.