The currently deployed Raspbian Linux kernel package
raspberrypi-kernel in version
1.20180328-1 contains a bug that renders PMS on all Raspberry Pis useless at the moment. Please either migrate back to a 4.9 kernel or update your kernel with
rpi-update to a newer development kernel. As soon as Raspbian updates their kernel package just install the new package and you will automatically migrate back from the development kernel to the stable one.
I will remove this announcement as soon as this bug is fixed in Raspbian.