Yes, that’s one of my suspects 
. And I tried to analyze the changes on github, but I can’t find anything that might make it stop working….
One thing that I remembered and that suggests that special rights / permissions may now be needed was the following sentence that @dcaliste wrote here some time ago about the then newly introduced call filtering feature:
I can’t find any further information about it anywhere, though. I already PM’ed Damien, hopefully he would be able to shed some light on it.