building issue

[Mr Madness]

i am trying to place a wall on my foundation and when i press space bar or page up etc etc it dosnt do anything

 

any one know how to fix this?

 

a video to show whats going on

 

http://youtu.be/PxFaiVzl0dI

 

*if you cannot view it atm then please wait as its finishing uploading*

[vbawol]

Custom changes can break this feature, revert to vanilla epoch then add your mods one at a time to determine where your problem is.