If you are considering running ETX preview via RDP (Remote Desktop Protocol) or CUDA (Compute Unified Device Architecture) based drivers, you might not get the expected results, e.g. blank screen is present.
For instance, in the Server installed with Nvidia card drivers, when you access to ETX preview via RDP session, the connection is established using RDP virtual GPU adapter rather than the active GPU, which would not be able to access to Nvidia drivers. Moreover, if you are using NVENC encoder, accessing to ETX preview via RDP would not be possible.
Alternatively, TeamViewer is the suitable tool as it provide an ability to access to Nivdia drivers during a remote connection.