#Not enough RAM
>>17+ MB DXF file
It sounds like you're using an ASCII DXF file. If this is coming from AutoCAD
(as opposed to a non-Autodesk program), you can pick the "Binary" option and
get a MUCH smaller file… dramatically smaller. And it'll be quicker to load.
Also, as mentioned, you might need to break any massively large or complex item
up if there's a chance it'll import with over 64,000 faces.
Dave