UE 5.8 - Mesh Terrain Partition - crash at the start all of a sudden

Hi there,

I just got back to UE after about a year with the new 5.8 release and mesh partition for landscapes.

I followed this tutorial by Unreal Sensei with no problems: https://youtu.be/Lhj2LutYNjA?si=K0rvQ-sXjXTLBstM

I re-opened my project and created a new map from scratch but now the program keeps crashing as soon as I place a brush modifier. Like the most basic thing…

I’ve opened my previous map (where I followed the tutorial) and now the program keeps crashing as soon as I move any of the modifiers, where just a few days ago I had no problem…

anyone have any clues of what may be happening? I’m not putting my computer on stress while UE open, besides Chrome with 3 tabs and spotify. Definitely not more than what I had days ago with the tutorial.

I’m on a Macbook M1 Pro, 16gb ram, 10core cPU, 8core GPU. Not the best but it worked.

I really don’t have any crazy meshes. I’ve just played with the modifiers tbh.

Only difference: I’m using a second viewport on a separate monitor. Could this be it?

I’ve tried re-booting it but the problem persists. Maybe I should just create a new project? Not have too many maps in one project (although I think it loads one at a time so It should not be an issue)? Just trying to figure out if it makes sense for me to keep exploring this mesh terrain with my specs.

a few screenshoots of what I have, which I don’t think is a lot…

any thoughts are appreciated!

It sounds more like a UE 5.8 bug than a hardware limitation, especially since the same project worked before. I’d test in a brand-new project to see if the crash is reproducible, disable the second monitor just to rule it out, and check the crash logs for the failing module. If it crashes in a clean project too, it’s worth reporting as a 5.8/macOS issue. Posting the crash report or call stack would also help others pinpoint the cause.

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I think it was that. Cause now the project workes absolutely fine without me doing anything different. and I’m keeping the viewport on my separate monitor as well…