Unfortunately, after 3 hours the HLOD build failed, I also see an unusual amount of memory used by Fortnite/ editor. I think it failed on the memory. Never had that one before.
So I guess first I need to figure out why its hogging double the memory then it used to.
And then figure out why suddenly HLODS are failing. Although I did read other posts with the memory issue. And it looks like they are investigating that issue.
That size thats showing, is that about the size of the original 4 grid planes ?
I think it is smaller than the original grids, because I used the XL island, but it seems to be showing a smaller area, like the smaller island. I also read somewhere you should make those grids larger. I already did that, so they cover the whole map. But that is also not working.
So perhaps first I’ll need to figure out the HLOD building part. But I’m afraid, with the current memory issue, I won’t be able to rebuild them. And a bunch of other errors, may have something to do with the update today (perhaps it was offline for a bit). I’ll first update the graphics cards, then restart the pc and everything, and I’ll try and run a new one.
UPDATE: So there is a current update, which is probably while it failed. 
Once update I’ll try again.