Another way is to use the monitor in control panel. Set the ID of the monitor (here 1) to the output of the NDI 5 Watcher. That's it. You can choose the size of the monitor in the control panel as you want. You don't need any extra stage for the preview.

Best regards

Jean-François 

OK, lesson learned - it was a corrupt file at 

/Users/theatre/Library/HTTPStorages/com.troikatronix.isadora

When IT uninstalled and reinstalled Izzy it works on 26.7.1. Live and learn. Thanks all! FAS

@jonathan

I can confirm the behaviour you are seeing. I am recording this as a bug, however, there is a simple work around.

Set the 'speed' input of your movie player to INIT = 0add an Enter Scene Value actor, and set it to 1, and connect it to the speed input.

This ensure playback doesn't start and that the movie is see as active (required for preload).

NOTE: preload is not generally recommended, it requires special care to use it effectively, and due to improved scene loading introduce in Isadora 3 isn't necessary except in extreme cases.

PLEASE read the following support article to better understand the preload actor. 

@jrhooker

Try putting another camera (any camera) up on the same pipe to see if it has a bouncy image as well.

What is upstairs from you? If it's something like heavy machinery or a dance studio, that could make your ceiling shake.