Building was made in 10.RC and now in 10.2 water react as ground. and ask for clear free space to place the block. On EGW server as on SBS. in 10.0 10.01 we could build under water water was like air. Now water is seen as sollid and must be away to build
I've seen this same behavior. However, I noticed that it seems to do with the center of the block being too near the surface of the water, because if I go deep enough below the surface then it will let me place a block.
Yeah last hotfix, the repaired it. Still dificult if you want from deep water to surface and have landing platform. They did now fixed it if i read the patchnotes, now i need only to play to check it agian.