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Excellent, yep that fixed it.
Actually, I can see how some people may wish to keep it as a sort of old-school transparency effect.
For myself, it was too reminiscent of flickering in NES games, so glad it was such an easy fix. Thanks for getting back to me so quickly!

There is an issue I did notice, I'm not sure if you've come across this yourself, but I did see this in the sample project also. 

When two different actors end up in the exact same Y position you'll get flicker between them as they seem to fight for dominance using Z-Order.

Had a look through the behaviours I had, and health was one (from the old Side Shooter pack I believe). Removing it and then imported your pack and it did the trick, thanks for the assistance Luyren!

Creating a new blank game and importing the resource pack went smoothly, was able to compile no problem. So not an OS issue.

The likelihood of having a behaviour already called Health would be extremely high. When I get home I’ll double check though.

May have come across the issue, in the sample game, everything was fine. But in my already created game, there is a <"custom-2" (custom block) 0:> block. It should have been the <Infect Damage: Damage> block.

Haven't used anything from it yet, but after importing the resource pack into my existing project, I got this upon trying to test my game. Any idea what might be happening here? Stencyl 4.1.0 (b11017) macOS 12.4