llazzllo

I'm aware of all of that, Mohawky. and I'm used to the lag spikes that come along with structure generation, and if it were just that, I would not be...

It's falling sand that's causing the problem. Here's an example. I'm assuming that this Island is one of yours, because it has no biome of its own (it shows Deep...

And these are the other islands that I've had the same problems with. I've had plenty of other islands generate (again, with deep ocean as their biome, so I'm assuming...

Biomes o'Plenty as the world type. I have several other mods that are generating structures, and I'll list them all if you want, but nothing else is causing this problem,...

I do have better mineshafts, and better caves. But the ocean in the pics you referred to are 30 blocks deep, I just measured. Vanilla Deep Ocean biome.

What is UBC? I don't have anything that replaces a vanilla stone type that I know of. And it doesn't seem likely that Yungs would be generating holes in the...

Yeah, I was thinking that earlier, but I went down in spectator mode, and there's no void or cave under the ocean floor beneath the island.

Yeah, I can do that. Gimme a couple of minutes.

IslandsCastaway7, IslandsWaterfallUndead, IslandsAbandonedHauntedBirchForest, IslandsCrabmanCaverns OR IslandsAngryBirds (those two generated too close to tell) The last two had a dungeon generate under them (which was not filled in with sand), but...

Mods that we have that generate (Structures, blocks or plants) in the overworld: Advent of Ascension Better Caves Better Mineshafts Biomes O' Plenty Birds Nests Botania Bountiful Cathedral? (Not sure...