RDP + DYNRES: Screen is black immediately after connection and becames visible only later when DISP_DVC_CHANNEL_NAME is connected
Remmina 1.2.0-rcgit.26 Connect to a win10 RDP server with dynamic resolution enabled and with another user already connected. Windows 10 only allow one user at a time, so you should instead see a warning message and a Yes/No request to confirm other user logoff. But you will only see a black screen.
This also happens when waiting for the remote RDP desktop to become ready, with dynamic resolution enabled: you can't see the windows animation. Only a black screen is shown.