All sorts of possibilities. Attach the DXF and it will be sorted out.
For future reference, ask what version DXF is being generated. Vectric products "like" R12 and AutoCad 2014 DXF formats.
Don't bother with trying to connect in AutoCad. Just import the DXF into the Vectric software and do your editing/connecting there.
If you are using version 9 Vectric software, the vector validator tool will identify problems and help a LOT if the DXF file is funky.
-ShopBot Buddy PRSAlpha CNC