Minor issue with picons loading. If the box is rebooted fully, the picons will not load. I always have to reboot Enigma2, and then the picons always load. This is a new problem with Duo 4k, I never had issues with Duo2 on older images with the same setup.

My picons are on a USB 3 stick on the back of the box and there's a symlink at /usr/share/enigma2 pointing to the USB device.

Log at bootup, same lines for full reboot and Enigma2 only:

[Picon] adding path: /usr/share/enigma2/picon/

And then a bit later:

Current Picon Path : /usr/share/enigma2/picon/

But still the picons will not load. There is no errors in the log regarding picons or the USB drive. After Enigma2 reboot, picons load and they continue to work just fine until the next full reboot. Also, it does not matter if there are any other USB devices plugged in or not.