SkyStar HD2 - Diseqc problems.

Operating system is Windows 7 64 bit, drivers and progdvb are latest. The problem is, diseqc is always stuck to 1st input, works only sometimes. After many many restarts of computer and progdvb, it starts working, untill the next restart. I've tried various diseqc settings, such as delay time and command repeat - no luck. What can I do?