After I place one item the next item I select won't place, it flips back to where it was previously, or is carries around by my mouse indefinitely. I found by clicking a different tool across the top...
I've figured out how to go around the build mode glitch. I download one of my very old save build, then I use the sledge hammer to delete it & build anew build. It actually worked for me. Oh, & I'm only a vanilla player on my PC.