I've found a big problem: VDR can't use both my DVB cards at once. They're both Hauppauge cards using the saa7146 module (I'm not sure if they both use the budget* modules though), but one is DVB-S and one is DVB-T. I expect it's because they're both based on the same chipset that's confusing VDR. Is there a fix available? I'm using 1.6.0-11 from Debian, patched for Freesat and rebuilt, but I'm willing to try 1.7.* if that's what it takes.
What does your channels.conf look like?
Sounds odd - I'm using the saa7146 driver on 2 cards (although both Technotrend)