I have a DWF file that consistently hangs both the 32bit windows and MAC versions.  After loading try to move one of the polyline entities.  Almost immediately after giving you the red/green crosshair it will lock up and eventually give you an hourglass on Windows or swirling vortex of death on the Mac.  Has anyone seen this before?  Any ideas?  Desperation is setting in.  Here is the file: Example DXF File