Version: 0.9 (using 4.00.80 (KDE 4.0.80 >= (KDE 4.1 Beta1), compiled sources) Compiler: gcc OS: Linux (i686) release 2.6.24-16-generic If there is a 1-block open space (surrounded on 2 or 3 sides) it is sometimes not possible to build a wall in that space. I will attach a picture showing a space that I cannot build a wall in. Actually, on this example, I could build a wall vertically, but I could not build a wall horizontally. I have also seen an example where a vertical wall was stopped 1 block short of reaching the other side and in that case I was able to build a horizontal wall, but not a vertical wall.
Created attachment 24917 [details] shows space where I cannot build a wall The red arrow points to an open space where I could build a vertical wall, but cannot fill the space by building a horizontal wall.
Confirmed in KDE SC 4.3.90.
Im working on this problem.
Fixed in revision 1107706. Thanks to Danyluk Tamás for this fix.