Remmina - The GTK+ Remote Desktop Client  v1.4.33
Remmina is a remote desktop client written in GTK+, aiming to be useful for system administrators and travellers, who need to work with lots of remote computers in front of either large monitors or tiny netbooks. Remmina supports multiple network protocols in an integrated and consistent user interface. Currently RDP, VNC, NX, XDMCP and SSH are supported.
Black-screen

If you have a black screen when connecting to a remote Windows server and you have a recent version of Remmina (>v1.4.8), unset or change the microphone redirection option.

image

Looks like in some border cases that string is set to 0 or other wrong values.