Black screen on Remote PC after disconnecting. Session appears to be hung or unresponsive.

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Just hit CTRL-Alt-Del twice within 10 seconds to unlock the screen.

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Problem Cause

Cause is still under investigation but this is the only known work around.

Black screen on Remote PC after disconnecting. Session appears to be hung or unresponsive. Hit CTRL-Alt-Del twice within 10 seconds to unlock the screen.

https://support.citrix.com/article/CTX217194/physical-computer-displays-black-screens-after-terminating-a-remote-pc-session