exporting DXF's in 2012

Lately I have been having  issues exporting drawing to DXF from SW. I have been exporting DXF forever (since SW1998) for certain uses. Now in 2012 for some drawings it does not export the model views.  It seems to occur with more complex models. Any one else seeing this? 

I am on WIN7, My video card (FirePro V4800) driver is up to date

Thanks

JF

SolidworksImport export