The log file you posted reports an error in the look and feel, and I'm not sure I can fix that.
Please, try to use a different Windows theme, or run Sweet Home 3D with a different look and feel by adding a file named [font=courier new]SweetHome3D.l4j.ini[/font] in the same folder as [font=courier new]SweetHome3D.exe[/font] and writing the following line in it (with the starting hyphen): Hope this will work...