Can't sleep iMac display with Quicktime Broadcaster

When I run Quicktime Broadcaster on my iMac, the computer's display will not sleep. I clearly don't want the monitor on 24 hours a day. I can briefly force the display to sleep with hot corners set to sleep the display, but it will wake within a minute or so.
If I quit Quicktime Broadcaster the display will sleep just fine. Also, I don't have to actually broadcast anything for this to happen, just running does it, as will running QTBroadcaster from the command line via "broadcasterctl."
Any ideas?

HI and Welcome to Apple Discussions...
Try Resetting the PRAM
If that doesn't make a difference, might be a good idea to run the Apple Hardware Test
Carolyn

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Can't sleep iMac display with Quicktime Broadcaster

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