After last updates there is missing audio on screen 3 and 4 if DD/DTS downmix option is turned off. On Ultimo4K at least.
VU+ Zero - VTi 13.0.x
VU+ DUO2 - VTi 13.0.x
VU+ ULTIMO 4K - VTi 13.0.x
VU+ DUO2 - VTi 13.0.x
VU+ ULTIMO 4K - VTi 13.0.x