I regularly get sent DWG files containing Ordnance Survey base mapping (variously with & without additional layers). I usually re-scale & reposition these in Draftsight, or just run a conversion in Teigha Converter. So far so good.
I have received a DWG with OS mapping & a site boundary. If I convert that to DXF(I usually have success with 2010 ASCII), all I get in QGIS is the site boundary polyline & a load of points.
If I open in a CAD program (Draftsight,QCAD etc) , the DXF that doesn't work in QGIS, I can see the whole drawing.
There is only 1 polyline entity in the import box, so its not that they're all down at 0,0 or something.
I can reproduce this on Linux & Windows, so not related to that.
Any idea where to look?