Same problem here.
Using newest OSCam Version (yesterday from repository compiled) and newest tvheadend Version (~4.1.8xx)
With older Version my configuration with dvbapi worked perfectly.
Since Switch to newer dvbapi protocol Versions, and port Settings, camd.socket didn't work. :(
currently switched to newcamd protocol...
but here's the Problem, sending EMMs to wrong Card.
(I have two Cards with CAID 098E, and different programs, and every EMM is sent to both Cards, even when program is only available on Card 1)
with older dvbapi Version was no Problem... EMM sent to correct Card.