Blue Iris UI3 only showing substream

Sqvirrel

n3wb
Aug 23, 2025
1
0
Norway
Hello!
Pretty new to Blue Iris, and my setup has been up for about 1 month with 5 cameras.

The problem is as follows:
When I watch all the cameras at the same time in UI3, only substream shows, all well and good.
When I doubleclick a camera to look at it fullscreen, it still shows me only the substream. I know this because the resolution is horrible and unchanged, no matter what streaming quality I select in the dropdown box. I can also verify this because when I fullscreen a camera, it still shows me only 10 fps (sub stream), and not 20fps (main stream).
In Blue Iris itself, when I fullscreen a camera, I can see it change from low-res to full-res after a second or so, so the problem is isolated only to UI3.
If I download a recorded file, it is full resolution.
I cloned one of the cameras, removed the substream, and then the main stream was sent over UI3, I got 20fps, and changing the streaming quality on the dropdown actually made a difference.

Any idea to why UI3 insists on only broadcasting the substream to its clients, even in solo view? I am happy to provide more setup details if needed.

Thanks
Sqvirrel