The game engine refuses to treat the wall foundation as an actual foundation so when something demolishes, it breaks everything that the game believes isn't on a foundation. I'm trying to figure out why but am not having any luck so I removed them from crafting options until I can find a remedy. You can still spawn them if you're in single player and an admin in MP can spawn them as well.

Thanks Hogs.

Would using the big fence foundation as a template give you any ideas on how to fix it.

I'm going to start with duplicating the castle foundation and making a new mesh. Originaly the wall foundation was a fence foundation and switching it to regular didn't help. I'm pretty sure that the length of the item with such a narrow width is what was keeping it from being placed, (the original cause of the issues). I'll be testing out a new mesh this weekend.

Are the snap points on the wall foundation disabled?

hows it looking going better with these foundations?

is the castle wall foundations working now?

Having a new mesh is not helping the design. I've made posts around asking what could be calculated to make them game refuse to allow them to place and no one seems to know. Making them really small or full castle foundation size works, but the long width and short depth seems to confuse the code for some reason. Every time it refuses to place unless I remove the 'foundation' part and just make it a placeable, but that causes massive wall breakages when you demolish anything. At this point I have more than twenty hours trying to make that work and have stopped until Wildcard comes up with some better answers than nothing. You can still spawn them and place them and can also find them in the admin box as well. I will update the wiki to reflect that change as being for the forseeable future.