Multi Pass Chroma Keyer – Can Only Select One Key Color (UE 5.5, Apple Silicon Issue?)

Development Cinematics & Media
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Hello everyone,

I’m currently working with Unreal Engine 5.5 and experimenting with Live Compositing, specifically the Multi Pass Chroma Keyer. While the settings show multiple slots for key colors, I am only able to select one. When I try to add a second key color, the previous one gets replaced, or the selection simply doesn’t work.

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I know there was a similar issue in Unreal Engine 5.4 (see this forum post), which was supposedly fixed in version 5.4.2. However, since I’m working in UE 5.5, this functionality should be available.

Has anyone else encountered this issue in UE 5.5? Is there a setting I might be missing to enable multiple key colors?

Any help or workaround suggestions would be greatly appreciated!

Thanks in advance!

EDIT:
I have now tested the same project on a Windows machine, and the issue does not occur there. This makes me suspect that the problem might be specific to Apple Silicon (MacBook Air M2).