Exiting RDP from server will result black screen screenshot on server

Hi, I have observed this issue to re-occur in RDP on Version 10.9.5 (2179) on
macOS.

Issue:

When I login to my server via RDP, screenshot (performed by scheduled desktop
screenshots + email of png to my email.) works fine. However when I exit RDP
and perform screenshot on the server again, the screenshot becomes black.

I think the exit or RDP from the server didn't set the screen back to normal. I
have to restart the server again (and without any RDP into server) in order for
the screenshot to work.