Not too familiar with the Twinhan CI cards , although a quick search on the forum did show that You weren't alone with CAM compatibility problems.
One fellow member was having problems running a Matrix cam with a Twinhan card.
When You say You have a Conax and Viaccess cam , I imagine it is in 1 unit (not 2 seperate cams).It may be that the card with not work with multi-encryption cams.
Check out the link below for details on the card and a list of compatible cams. http://www.twinhan.at/?tpl=/products-1-2.html
Is the FTA stuff coming through OK?If so then the card is working OK.
Have You used this combination of cam and Twinhan before with success , or is this the first time?
Hope that this has helped You a bit , and i'm sure that a member who has a Twinhan card will be able to help with the more technical stuff.
All the best with the card,