Is the sheet properties scale 1:1? If it's not that could be the problem.
When you do your File > Save As out of your slddrw what are your settings under Options for the Base Scale dropdown.
What is the slddrw Sheet Properties Scale and what are your View Properties Scale? Are you sure they are all 1:1?
The slddrw Sheet Properties Scale was 8:1. Changed it tp 1:1 and it works!