Connecting to new Unit with AMD X7100 Graphics card. Screen goes Black

BigMacMcC

i have a new HP Z4 G4 Workstation to support. (TV client version 15.16.8)

unit running Win10Pro for workstations 64bit 20H2

with AMD X7100 8gb Graphics card (Q1 2021 driver suite)

I can start TV session but while the main Deskop looks ok

the windows start icons size are messed up (tiny, unreadable)

and if i do anything or get another partner to join the session

both our remote screens go full Black..

if 2nd partner leaves i can eventually get screen back by

toggling on/off the hide wallpaper switch a couple of times

has anyone seen and more importantly sorted this issue out?