Blank screen blanks another remote host. see descrip
"One question though, when I have a 3rd party vendor remote into a machine with me using teamviewer, it seems to blank the screen out for them as well. Is there any way to make the blanking only apply to the users's monitor but will allow access from other on-demand remote software?" Ticket 7665564
Sounds like it's working as intended. You're sharing the client's screen --that you've blacked out--. If you want to share a screen with someone else, you should unblank it.