Hey there,
The way that the place building and give unit commands work is using traces from above and below the mouse to see it hits landscape, I think whats happening here is because your landscape is so much higher the 0,0,0 that the trace isn’t hitting any of your landscape if you move down your landscape so that the flat area that you where using is ruffly level with the included landscape this may fix it. Another cause could be because the trace is looking for a landscape actor and not a landscapeproxy actor. But if you try moving the landscape down this may work, I’m currently working on a large update for this pack so Ill make the mouse traces higher by default and look in to the landscapeproxy information.
Very sorry for the issues and thanks for being so patient with us.