I found a possible explanation on the dvbviewer forum by Griqa:

" AFAIK the XE stick is not supported by DVBViewer Pro. It requires special means, because it's an USB 1.1 device, that is not able to deliver a whole transponder (like BDA USB 2.0 devices), due to its limited data rate.

That's why ...

The device in use is:

{BDA} Cinergy T USB XE Tuner -- BDA.Device -- 1.45 -- 1.33

(The other device: {BDA} Cinergy T USB XE Tuner -- anysee.Device
does not function)

I can find the channels too..
BUT
ProgDVB (versions 4 and 5 latest versions) can only find the channels after I started the TerraTec Home Cinema program and close it down again.
Furthermore:
Video on a certain channel is only displayed if I select that channel with the TerraTec Home Cinema program ...