I have iClone 6.52.3420.1.  I have defined three cameras and am trying to switch between them.  I went to the timeline to the switcher track and right click on the frame in the switcher timeline where I want the camera to switch, and select the correct camera.  Reviewing the switcher timeline everying is checked in the right places--but when I play back there are no camera switches.  What am I missing?

Is it possible you still have your camera in your editing window set to "Preview" or one of the three cameras?  It needs to be "Switch."

I've come back to look at the results of a 2-hour render, only to discover I forgot to set that before rendering.  Frustrating, but gradually your mental checklist of mistakes not to repeat gets better and better.

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iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
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Thank you!  One click to select "switch" was all it took, and the cameras perform as programmed.