Hi , i had the same problème on my VU+ Duo 4K SE BT Edition , Open Pli 8.3 ,it as was working , i was using Xtreamity when a lost the network link (non internet , no local link by DCC)
I had rebooted the STB et thenn , all ok but no OSD on TV , only picture of channel was OK
On Web interface no problème all was ok (picture and osd)
So , i did what nunigaia say and now it's ok
So thank you mister
nunigaia