I have build 4 and when i go to change the wall texture, I am having problems getting the wall to change.
I have tried changing the default and selecting' change all to default'.
And, I've tried just using the paint roller.
On a separate note, when in the line drawing editor, I can't select the text to delete.
I tried it and it seems to be working fine. Did you try going in to the room layout and then click on custom layout parameters and changing the wall texture default before creating your walls?
On the main room layout screen, right click and select Texture options, then wall/floor, then change texture. A little texture box appears in the top left corner. Select you texture. Then press control and a paintbrush appears. Click on the wall you want to paint. Wa La. (Hopefully)
Problem solved ! when I take it to presentation view, the wall is the right color. Just not in the detail room. I am using a soft beige, and in the detail room, it is green.