Hi @JanS
I am experiencing exactly the same problem with the latest update 
My logs are here https://paste.osmc.tv/ozukiwowap
Let me know if it’s still necessary to install librelec (I hope it’s not 
)
Fallling back to previous kernel version now…
osmc@osmc:~$ sudo apt-get install --reinstall rbp2-image-4.14.78-4-osmc
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reinstallation of rbp2-image-4.14.78-4-osmc is not possible, it cannot be downloaded.
The following package was automatically installed and is no longer required:
rbp2-image-4.14.78-2-osmc
Use 'sudo apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
osmc@osmc:~$ sudo dpkg-reconfigure rbp2-image-4.14.78-2-osmc
Running depmod.
Examining /etc/kernel/postinst.d.
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal 4.14.78-2-osmc /boot/vmlinuz-4.14.78-2-osmc
run-parts: executing /etc/kernel/postinst.d/apt-auto-removal-osmc 4.14.78-2-osmc /boot/vmlinuz-4.14.78-2-osmc
run-parts: executing /etc/kernel/postinst.d/inform-updater 4.14.78-2-osmc /boot/vmlinuz-4.14.78-2-osmc
run-parts: executing /etc/kernel/postinst.d/process-vmlinuz-rbp 4.14.78-2-osmc /boot/vmlinuz-4.14.78-2-osmc
osmc@osmc:~$ systemctl reboot -i
Digital output is back again together with mutichannel audio 
Thx for help!
Cheers
tiroy