I have found a problem with IF->THEN module and use of binary switch as well
( Posted here https://forum.z-wave.me/viewtopic.php?f=3419&t=24318 since I didnt see this thread, sorry about that)
I downgraded IF-Then to 2.0.5, then Binary Switch state input works for me... But of course functionality in the newer versions are lost, but thats ok for me, for now.