Rendering showing flickering green squares

[sam.skirrow]

Hey there,
Rendering out a scene in Ue5 and noticed a few issues. The main one though is these big green (sometimes black, sometimes pink) squares that keep showing up over he render.
From what I can tell, it happens when I set custom AA values (for the most recent I was using Spatial Count 1, Temp Count 16).

When I render with default AA settings, the squares aren’t there - but weirdly, when my camera flies by a metahuman, there are several small flashes of light, which seem to cause some lens flare - it’s the same colours, but it looks cool, so we can get away with it - although not really the desired effect - but I’m wondering if it’s all related.

Question is - how do I get rid of these flashes/squares? And what is causing them?

See screenshot of squares when using AA, and flashes when using defaults.

[BarryLegg]

I’m also suffering with this issue. Can’t establish any pattern to it, using Pathtracer lit with a basic HDRI backdrop blueprint, plus exp. heightfog, and a dir light. Green squares exactly the same as we see in OPs image randomly occur only on characters hands and faces - which are using SSS materials. Same characters, same environment are used in many other scenes in project without issue, but on one particular scene - these green squares are proving to be an insoluble problem. Any insight would be appreciated for both OP and myself.

(P.S apologies to OP for getting your hopes up with a reply that doesn’t offer any solutions, but i’m right there with you dude )