I hope I am posting in the right forum. I haven't been here in a while and see that there is one forum for C3D 2011 and one for C3D 2009 and below (?)
Anyway, I have a C3D 2010 drawing into which I have xref'd the survey drawing. I have made sure that all layers for this attachment are on, but many of them are not showing up in my drawing. I can open the survey drawing itself and see the layers there, but they don't show up when xref'd in. I have attached the files -- 10-0157.dwg is the original survey drawing and bkgd816006pa.dwg is the drawing into which it is xref'd.
Thanks for looking.