The entire UI in SDS v1.0.5 flickers on when Nvidia G-Sync is active on the primary monitor. I think SDS is driving the monitor to very low refresh rates. It is very distracting after while. I notice SDS uses the Unity engine.
I was able to fix this by go to Nvidia Control Panel → Manage 3D settings → Program Settings → Add SDS to the list, then change Monitor Technology to Fixed Refresh.
I imagine there are settings in Unity to fix this being a very low priority issue. I am using SDS in Windows 10 x64.