Some good news. I have tracked the issue down and found it is because when you enter VR the CustomDepthStencil is being set. This is causing the widget component in the Avatar to get invalidated. There are two possible short term solutions. The first is to turn off MU transacting CVAR changes. You can do this from the Console Variable Editor:
You need to set “Multi-user Console Variables Synchronisation" = false.
The second solution is bit more heavy handed and should really only be used if you need the CVAR transactions on during your MU session. Unfortunately, you will need to add this to the BP_VScoutAvatar (on each machine going in to VR). This will recreate the UMG menu widget whenever it goes invalid.
We will try to come up with a better solution for 5.8 but hopefully this unblocks you for now. Sorry for the difficulty this has given you.
