Been away for a few days. Sometimes it helps to leave a thing and then come back to it. Didn't help this time. And yes I have been staring at that framing defaults dialog... again. Like I said, I can easily change the thickness but the material box at lower right side of edit dialog (with the arrow pointing to "structure") is not clickable - it is stuck on concrete. This really should be quite simple and I know I'll feel silly when i figure it out... I will attach plan file.
Ok so I'm having trouble with that too. I get a message that says: upload skipped (error302)