Foolishly I did the same thing in DVBViewer as Lindhardsen, I unchecked the 'Open whole transponder' to see if I would get any picture there as well. And I did, though very jittery. And after that nothing worked in MP. Couldn't watch ANY channels, or do a scanning for channels. So I marked 'Open whole transponder' again, but that didn't help. Several reboots didn't helt either and I even uninstalled DVBViewer and still got nothing in MP. Finally I created a new ini-file for scanning (basically just copied the one I was already using) and after that everything worked again! Weird, to say the least.
But of course the TV4 HD Fotboll channels are still working as bad as before; not at all.
Now, I don't even know what the 'Open whole transponder' does in DVBViewer (or apparently to my entire system!?), but it would be nice if the same setting could be done in MP. But I can't find anything like it. If it exists, maybe it's called something else?