Ive noticed that Slate has a Black square under the ground when ever i play it. and the ground texture seems to not be showing up. this also happens on Ladios' slate edits. here is a pic
Currently the Mac version of Blockland has several issues that haven't been solved.
Perhaps your blockland isn't rendering the waterblock. That huge square you see is an interior.Try re-installing your blockland, if that doesn't help then you're out of luck.
bump, need help please