Take a look at their new support system, there is also a knowledge database. Obvious only in german. There is also list of supported CAM's
Digital Devices Support
http://support.digital-devices.de/knowledgebase.php?article=40
Edit: does your CAM support MTD? You could try to assign the CI to only one tuner.
Digital Devices Support
http://support.digital-devices.de/knowledgebase.php?article=40
Edit: does your CAM support MTD? You could try to assign the CI to only one tuner.