I actually got some error reports about people not being able to build anything.
After some investigation, it turns out that the green orbs (showing the possible build joints) are not rendered on some computers.
If you experience this issue, please let me know about it, because I actually wasn't able to reproduce this error - which is a bit annyoing .. it's one of the simpler shaders so I am out of ideas at the moment.
Please write here about your hardware setup, so I can try more things to reproduce this error.
Thank you!